New GMC 6.2 burning oil?

[Justfishing]

If you lookat it the engines are designed for cafe mpg. The rings and oil are to help mpg. Rings to day are very low friction compared to the old days. The oil is thing also. I would step up a weight or 2 in oil in hot weather.

Low friction rings allow more blow by. That indicates more frequent oil changes are needed. Not more than 5,000 miles.

 

[fastenuff3]

I wonder if the DFM is causing the oil loss? The wife's burb was built during the chip shortage and does not have the auto stop / start feature and I think it also does not have DFM. Maybe that's why we are not seeing oil loss. Researching on line reveals people are not seeing oil loss after disabling the DFM.

bingo.i shut the dfm off at 60000 and my suburban has 310000 and no oil loss.i use mobil one since new and change every 5000

 

[hman442]

you're the one believing it. article was written by a salesman lol.

I dunno, 30 years as a NAPA rep gives a guy a lot of street cred . I like the ones that come in to tell you all about NAPA brakes, etc., but last week, they were actually working at a shoe store in the mall!!

 

[hman442]

Just a couple comments, seems like if the Yukon was truly as low as the quick lube attendant stated, it would seem like the low oil light would have been on. Maybe he didn't put the stick in all the way, to make the oil show lower. It seems like those guys are often trying to "look smart" for their customers, just to have something to say.
Secondly, historically, RD doesn't keep vehicles to the 300,000 mile mark, so I'd just let them put in whatever oil they put in, run it, & trade it in when you feel like it. I used to worry about oil in my own vehicles much more than I do now, used to run top shelf synthetic in all my family vehicles, etc., then, after noticing vehicle after vehicle coming into my shop with quick lube stickers that were consistently 3-4k overdue for service, cheap oil, cheap filter, but the cars have 180k on them, oils full, engine sounds good, I kind of relaxed my requirements. I just use what is recommended, and try to not be too far over the mileage. As mentioned earlier, seems like we never see an "oil related failure", except when they just plain run 'em out of oil.

 

[Shlbyntro]

My son put one of the OBDII dfm disable device on his truck and say it has never run better.

almost like it's running on 8 cylinders

Running oil viscosity that differs from the manufacturer's recommendation is a really bad idea. The average SGOTI has no idea of the engineered clearances of engines that use 0W20 oil or the characteristics of that oil that have been certified by SAE/API as suitable for the intended use.

If I had a $120,000 Suburban I sure as hell wouldn't choose internet advice over GM engineers.

Although I agree with this statement I wouldn't consider it black and white. I caught them a few times trying to change the recommended fluid specs for vehicles Ford and Chevy alike to lower visc fluids that I knew were not the original specd fluids.

I always go with the original fluids despite any "updates" unless there was a large recall that justifies the change.

 

[Badchoices03]

I change my oil every 500 miles and check the level every 25 miles....

 

[Racey]

And they now call for 0w20 oil. Plus it’s over 100 degrees all summer, putting around Havasu starting and stopping.

They use these dumbass 0 weight oils to make that last couple percent for the EPA mileage targets. It's stupid. Especially in warmer climates

 

[Runs2rch]

They use these dumbass 0 weight oils to make that last couple percent for the EPA mileage targets. It's stupid. Especially in warmer climates

0/20 and 5/20 almost the exact same. Splitting hairs in hot viscosity and cold flow.

Add pack and base stocks is what I would be more concerned with.

 

[Justfishing]

Running oil viscosity that differs from the manufacturer's recommendation is a really bad idea. The average SGOTI has no idea of the engineered clearances of engines that use 0W20 oil or the characteristics of that oil that have been certified by SAE/API as suitable for the intended use.

If I had a $120,000 Suburban I sure as hell wouldn't choose internet advice over GM engineers.

Do the gm engineers go by what is best for the engine or what is best for cafe mpg. Or maybe the guy in mn that operates in cool and freezing conditions needs a different oil than the desert. They recomnend an oil that is good for many conditions giving a blanket statment to use an oil that is less than ideal because most car owners dont know jack.

its like tires. Is there just on tire pressure for all conditions? You may want a little higher pressure to carry a heavy load or get better mpg. It you want better ride a lower pressure.

 

[dribble]

Running oil viscosity that differs from the manufacturer's recommendation is a really bad idea. The average SGOTI has no idea of the engineered clearances of engines that use 0W20 oil or the characteristics of that oil that have been certified by SAE/API as suitable for the intended use.

If I had a $120,000 Suburban I sure as hell wouldn't choose internet advice over GM engineers.

I have seen running the wrong viscosity oil in some late model Chrysler products actually trigger a check engine light because the VVT system does not respond as designed with thicker oil.

 

[Done-it-again]

Damn, you would think people are still running leaded fuel.

 

[Racey]

Do the gm engineers go by what is best for the engine or what is best for cafe mpg. Or maybe the guy in mn that operates in cool and freezing conditions needs a different oil than the desert. They recomnend an oil that is good for many conditions giving a blanket statment to use an oil that is less than ideal because most car owners dont know jack.

its like tires. Is there just on tire pressure for all conditions? You may want a little higher pressure to carry a heavy load or get better mpg. It you want better ride a lower pressure.

In older vehicles like 2010 and earlier maybe, they would almost always give 2 options for oil depending on climate.

 

[Racey]

0/20 and 5/20 almost the exact same. Splitting hairs in hot viscosity and cold flow.

Add pack and base stocks is what I would be more concerned with.

That extra 20-30 degrees of ambient temp can be all the difference in the world from a 0w to a 5w

They spec these things to run on the ragged edge, so that last little bit can be just enough to make a difference.

 

[bk2drvr]

I agree with the post above that your oil probably wasn’t super low. The oil low warning would have been on. Change the oil and monitor it. You may be worrying for nothing. That motor holds 7 qts of oil so if it’s down 2 quarts and doesn’t register on the dip stick there is still 5 friggen quarts of oil in the thing. I bet you don’t have a problem. Monitor it from here forward and see what you got. I’d also recommend changing your own oil, all the time.

 

[TPC]

I was told mfgs no longer use a wipe ring on the pistons resulting in this issue.

Our 8.1 has always used 1 quart between changes not towing. Uses 2 quarts between changes towing.
Flirting with 200k miles.

RV’s:
Our Onan’s 5.5’s use a pint between oil changes until 300 hours then miraculously none.

Run the Onan’s at 1/4 showing on the dipstick operating zone or you may really see consumption.

A Onan service tech gave me that advise and he is spot on correct.

Piston engine phenomena.

 

[LargeOrangeFont]

That extra 20-30 degrees of ambient temp can be all the difference in the world from a 0w to a 5w

They spec these things to run on the ragged edge, so that last little bit can be just enough to make a difference.

This. 120 degrees, absolute minimum oil viscosity to appease the greens, extended oil change intervals on degraded oil… what could go wrong?

Oh the lifters that rely on oil pressure to activate cylinders.. those could go wrong.

 

[Racey]

This. 120 degrees, minimum oil viscosity to appease the greens, extended oil change intervals on degraded oil… what could go wrong?

Oh the lifters thst rely on oil pressure to activate cylinders.. those could go wrong.

That never happens right?

 

[pronstar]

Although I agree with this statement I wouldn't consider it black and white. I caught them a few times trying to change the recommended fluid specs for vehicles Ford and Chevy alike to lower visc fluids that I knew were not the original specd fluids.

Yup.
A while back carmakers really extended the maintenance intervals and sealed transmissions with “lifetime fluid!” on vehicles to get reported ownership costs lower.

Yet they changed absolutely nothing in the vehicles themselves.

Besides Toyota, carmakers really don’t seem to give a shit if things fail outside of warranty, because there’s a good chance it won’t be the original purchaser footing the bill.

 

[Runs2rch]

That extra 20-30 degrees of ambient temp can be all the difference in the world from a 0w to a 5w

They spec these things to run on the ragged edge, so that last little bit can be just enough to make a difference.

4 degrees is the difference.

 

[Racey]

4 degrees is the difference.

That's if we are to believe that the oil performs perfectly as stated on it's multigrade rating.

In reality that extra "5 degrees" of cold viscosity does have effects on the oil across the range of it's temperature.

I would probably be trying a 5w30 over a 0w20 living in havasu though, and up the hot end of the viscosity.

I'd also be running a high end synthetic like a Lucas or Mobil 1

 

[LargeOrangeFont]

That's if we are to believe that the oil performs perfectly as stated on it's multigrade rating.

In reality that extra "5 degrees" of cold viscosity does have effects on the oil across the range of it's temperature.

I would probably be trying a 5w30 over a 0w20 living in havasu though, and up the hot end of the viscosity.

I'd also be running a high end synthetic like a Lucas or Mobil 1

Spot on. The fresh oil is not the problem. The oil once degraded is the issue.

This near identical 6.2 engine in a Camaro or Corvette calls for 0w40 on the street and 15w50 for track use.

I’d do 5w30 in a heartbeat in Havasu.

 

[Runs2rch]

That's if we are to believe that the oil performs perfectly as stated on it's multigrade rating.

In reality that extra "5 degrees" of cold viscosity does have effects on the oil across the range of it's temperature.

I would probably be trying a 5w30 over a 0w20 living in havasu though, and up the hot end of the viscosity.

I'd also be running a high end synthetic like a Lucas or Mobil 1

Now we need to get into oil filters haha

 

[Runs2rch]

Spot on. The fresh oil is not the problem. The oil once degraded is the issue.

This near identical 6.2 engine in a Camaro or Corvette calls for 0w40 on the street and 15w50 for track use.

I’d do 5w30 in a heartbeat in Havasu.

Near Identical is not identical. I think the 0/20 is spec-ed to work better with AFM lifters also. Shit I don't know. Racey is the only qualified engineer in here.

 

[Racey]

Near Identical is not identical. I think the 0/20 is spec-ed to work better with AFM lifters also. Shit I don't know. Racey is the only qualified engineer in here.

I'm no engineer, but i've been around long enough to know that 0w20 oil is gonna have problems when it's 120F outside

The fact that they run these motors close to 230F doesn't help the issue either

 

[LargeOrangeFont]

Near Identical is not identical. I think the 0/20 is spec-ed to work better with AFM lifters also. Shit I don't know. Racey is the only qualified engineer in here.

All 6.2 LT1s have AFM. The lifter failures seem to be less frequent over there. I don’t know if that’s from sheer numbers or magic oil.

How many reasons are we going to pick out of thin air to justify water like oil? It’s not speced like that for longevity or performance.

It’s not my repair bill.. anyone can do what they please.

 

[Nordie]

That never happens right?

Nope not at all, I think it's been 4 weeks now and still waiting to get my truck back from a lifter collapse. The Fords aren't any better with the cam phasers either. The 5.0 I had I mashed the gas and it lost all oil pressure, it also smoked a little.

 

[D19]

I'm no engineer, but i've been around long enough to know that 0w20 oil is gonna have problems when it's 120F outside

The fact that they run these motors close to 230F doesn't help the issue either

Or how about the trans at 190+? I bypassed the t-stat, mine runs an average of 120-135 now.

I had a new 6.2 engine put in 5k miles ago. I'm due for another change and will go 5w30. I drive through the desert almost every week. My AFM is disabled.

I heard you cant get programmers for the latest GM trucks. I tried to get one for my buddies new Escalade but no one offers them yet.

 

[LargeOrangeFont]

I'm no engineer, but i've been around long enough to know that 0w20 oil is gonna have problems when it's 120F outside

The fact that they run these motors close to 230F doesn't help the issue either

The Data Sheet says it’s fine! Thicker oil bad and not needed. But you can run 15w50 on the track with the same engine in a car the OE advises.

 

[Racey]

The Data Sheet says it’s fine! Thicker oil bad! But you can run 15w50 on the track the OE advises.

There's a reason after 25+ years, countless iterations and testing that Brummett runs straight 50w in all his high performance motors.

He wants them to last, he doesn't care if he gives up a little power or mileage.

 

[LargeOrangeFont]

There's a reason after 25+ years, countless iterations and testing that Brummett runs straight 50w in all his high performance motors.

He wants them to last, he doesn't care if he gives up a little power or mileage.

RDP- Question everything but the owners manual.

Also RDP - New cars are junk and don’t last. What can be done?

Also RDP - Don’t you dare apply conventional wisdom and basic automotive principle to these finely tuned and precision engineered modern cars.

 

[Badchoices03]

RDP- Question everything but the owners manual.

Also RDP - New cars are junk and don’t last. What can be done?

Also RDP - Don’t you dare apply conventional wisdom and basic automotive principle to these finely tuned and precision engineered modern cars.

Also RDP:

RDP Member 1: "I change my oil every 10k per owners manual"
RDP Member 2: "Thats dumb, I change mine every 5000"
RDP Member 3: "Thats dumb, I change mine every 3000"
RDP Member 4: "Idiots, I change mine every 2000"
RDP Member 5: "I put a new engine in my cars every 1000 miles"

 

[LargeOrangeFont]

Also RDP:

RDP Member 1: "I change my oil every 10k per owners manual"
RDP Member 2: "Thats dumb, I change mine every 5000"
RDP Member 3: "Thats dumb, I change mine every 3000"
RDP Member 4: "Idiots, I change mine every 2000"
RDP Member 5: "I put a new engine in my cars every 1000 miles"

RDP member 6 - “You are all fools, I drive an EV and waste enough time charging it I could change the oil every 200 miles if it had oil!”

 

[pronstar]

Or how about the trans at 190+? I bypassed the t-stat, mine runs an average of 120-135 now.

Yeah they do that to lower internal friction for a minuscule bump in mpg

When i was at the ad agency, they wanted me to add “transmission oil warmer” to the specs we advertised…i refused, telling the marketing folks that won’t be a key selling feature

 

[lbhsbz]

The Data Sheet says it’s fine! Thicker oil bad and not needed. But you can run 15w50 on the track with the same engine in a car the OE advises.

It’s not the same engine. You are dense.

 

[LargeOrangeFont]

It’s not the same engine. You are dense.

It’s the same AFM, same valve train, same crank, rods pushrods rockers etc. between the truck and Camaro.

That different intake, cam and head casting requires different oil

Dense? We are talking about viscosity. I’m viscous.

 

[lbhsbz]

There's a reason after 25+ years, countless iterations and testing that Brummett runs straight 50w in all his high performance motors.

He wants them to last, he doesn't care if he gives up a little power or mileage.

Is Brummett running variable valve timing and sub 0.001” bearing clearances? I don’t think so.

 

[Racey]

Is Brummett running variable valve timing and sub 0.001” bearing clearances? I don’t think so.

Is that stock motor making 200+ft lbs per hole, constant duty? I don't think so.

The point being that clearancing the motor for heavier oil gives up some power, but gives you a much larger margin of safety.

I'm not saying a street car should be aiming for a straight 50w oil, but these 0w15 0w20 deals have really pushed the envelope to the brink of failure, especially if you live in a hot climate.

 

[FreeBird236]

Toyota must think 0w15 is too light, my Rav4 uses 0w16.

 

[D19]

Is that stock motor making 200+ft lbs per hole, constant duty? I don't think so.

The point being that clearancing the motor for heavier oil gives up some power, but gives you a much larger margin of safety.

I'm not saying a street car should be aiming for a straight 50w oil, but these 0w15 0w20 deals have really pushed the envelope to the brink of failure, especially if you live in a hot climate.

I can vouch for this. Total engine failure at 85k miles. Lots of trips through the hot desert and lots of towing.

 

[lbhsbz]

Is that stock motor making 200+ft lbs per hole, constant duty? I don't think so.

The point being that clearancing the motor for heavier oil gives up some power, but gives you a much larger margin of safety.

I'm not saying a street car should be aiming for a straight 50w oil, but these 0w15 0w20 deals have really pushed the envelope to the brink of failure, especially if you live in a hot climate.

The new toyota corolla GR makes 300hp w/ a 1.6L (187.5hp/liter) and specs 0W-20. By the above logic...a 454 making almost 1400hp should be fine with 0W-20, especially since it has an oil cooler fed by 75° lake water.

There's more to it, and I don't think any of us here know all the details or are lubrication engineers. Without knowing all the details, it's tough to tell the engineers that they're wrong, unless yore LOF.

 

[Shlbyntro]

The new toyota corolla GR makes 300hp w/ a 1.6L (187.5hp/liter) and specs 0W-20. By the above logic...a 454 making almost 1400hp should be fine with 0W-20, especially since it has an oil cooler fed by 75° lake water.

There's more to it, and I don't think any of us here know all the details or are lubrication engineers. Without knowing all the details, it's tough to tell the engineers that they're wrong, unless yore LOF.

As a mechanic I can say that engineers are always wrong!

now what were we talking about again??

 

[28Eliminator]

Lol.. 2011 FORD Raptor with 6.2 and 175,000 miles... Doesn't burn or leak a drop of oil.

 

[pronstar]

…unless yore LOF.

His initials could represent Lube Oil & Filter so that clearly means something for the topic at hand

 

[LargeOrangeFont]

The new toyota corolla GR makes 300hp w/ a 1.6L (187.5hp/liter) and specs 0W-20. By the above logic...a 454 making almost 1400hp should be fine with 0W-20, especially since it has an oil cooler fed by 75° lake water.

There's more to it, and I don't think any of us here know all the details or are lubrication engineers. Without knowing all the details, it's tough to tell the engineers that they're wrong, unless yore LOF.

You always provide great at pantamime when you get proven wrong .

That’s literally the opposite of the logic he laid out.

Corolla GR…

280 degree oil temps on track on a 90 degree day.

https://www.grcorollaforum.com/threads/oil-temp-on-track.2085/

Read the owners manual and run that 0w20 no matter what! The data sheet says it it fine!

 

[Racey]

The new toyota corolla GR makes 300hp w/ a 1.6L (187.5hp/liter) and specs 0W-20. By the above logic...a 454 making almost 1400hp should be fine with 0W-20, especially since it has an oil cooler fed by 75° lake water.

There's more to it, and I don't think any of us here know all the details or are lubrication engineers. Without knowing all the details, it's tough to tell the engineers that they're wrong, unless yore LOF.

Yeah on a drag strip 9 seconds, not pulling a grade, aka constant duty.

You can get away with a lot during short bursts.

 

[Runs2rch]

Yeah on a drag strip 9 seconds, not pulling a grade, aka constant duty.

You can get away with a lot during short bursts.

Sounds like my sex life haha

 

[SBMech]

I suggest you people read this bible by Smokey:

His ideas and proven theories on oil temps will certainly alter your opinions.

Maybe you might learn something new as well.

 

[pronstar]

Also RDP:

RDP Member 1: "I change my oil every 10k per owners manual"
RDP Member 2: "Thats dumb, I change mine every 5000"
RDP Member 3: "Thats dumb, I change mine every 3000"
RDP Member 4: "Idiots, I change mine every 2000"
RDP Member 5: "I put a new engine in my cars every 1000 miles"

HNIC: I trade my cars in before their first oil change

 

[GETBOATS]

Important in discussions like this one...........0W means it acts like a zero weight in winter. not Havasu summers

 

[LargeOrangeFont]

Important in discussions like this one...........0W means it acts like a zero weight in winter. not Havasu summers

Important in discussions like this one...........0W means it acts like a zero weight in winter. not Havasu summers

And the low in Havasu last year was 33 degrees.