2020 6.2L GMC Sierra burning oil at startup

[Sammytheo]

I have a 2020 GMC Sierra with a 6.2L. It has a total of 5900 km or 3670 miles. About 950 miles ago noticed that the idle was getting rough and when I would use the remote start in the morning after it sat overnight it puffed blue smoke out of the exhaust.  It disappeared after about 10 seconds.  Turns out that at lease 1 valve guide was not sealing properly. The dealer is changing all the seals on both heads and I am going to ask that the spark plug(s) also be changed since I believe they are dirty from the burning oil. Has anyone experienced this?

[Hooley17]

I have a 2020 GMC Sierra 1500 AT4 with the 6.2L. I have noticed while driving the truck that it blow blueish gray smoke out the back while leaving from a stop sign. Sometimes it is very large some times you can barley see it. Doesnt happen all the time. I changed my oil and after 2000 miles the low oil level light came on I was down 3 quarts of oil. I immediatly made and appt with the dealer. They told me I needed to do an oil consumtion test. So I did that. In 1000 miles I was down 1 1/4- 1 1/2 quarts of oil. They told me to bring it back in 500-1000 miles again. That was unexceptable to me. So after a few phone calls the dealer took the truck in to look at it. They had to call the GM engineers and talk with them they found that cylinder 7 had bad valve seals and valve guide. They replaced the entire cyclinder head. I picked it up on friday after them having it a week. I drove the 11 miles home. On saturday I drove 70 miles and sunday night on my way to work 23 miles it blew a big puff of smoke again. So monday morning I took It back to the dealer and told them it wasnt fixed. They look at it and on tuesday they said they vouldnt find any issues with the truck and for me to pick the truck up. So I reluctantly did. Called GM help line. I already had a case because thats the only way the dealer would look at my truck and explained the situation. The escaladed it up to their SR advisors. So I waited 2 days to hear from them just to repeat myself of everything that was said in the first 2 conversations. They tell me they have to reach out to the service manager and will call me back on monday. So yesterday they call me back just to tell me that they havent been able to get in touch with thwm and they would call me back on weds. So meanwhile I am driving a brand new expensive truck that smokes when it wants to and burns oil. The dealer has already told me its normal and wanted me to except that for an answer. So far not good customer service from dealer or GM. I guess a smoking burning oil issue isnt a safty concern. I have taken videos of it happening because the dealer cant replicate the problem and says it doesnt exsist. Showed the video to them and they say a cloud of smoke is normal. 

[NE18]

Can’t imagine these puffing trucks would pass an emissions test. 

[PPK]

mexican engine or usa ?

[Hooley17]

How do you tell if its mexico engine or american engine. The truck was built in fort wayne indiana. 

[Rodek]

The engine assembly location is on your truck's new window sticker. My 5.3 engine and transmission was made in Tonawanda new York. 

[Hooley17]

I will have to look.

[Jay Curlin]

I didn't know GM had an engine plant in Mexico. My 2020 GMC Sierra was assembled in Mexico, but the 5.3L was made in Flint.

[Jay Curlin]

Hooley17, I can understand your frustration. My brother in law in Fort Worth has a 2019 AT4 with the 6.2L. Drives the hell

out of it on his ranch & in the city. I will ask him today if he has had issues. 

[Jay Curlin]

I know GM has great engineers & their engines are thoroughly tested. I wonder if 0W-20 oil has anything to do with it?

 

Ford still uses 5W-30 & I wish GM could hit their mileage numbers with that grade of oil as well 

[Z45]

1 hour ago, Jay Curlin said:

I know GM has great engineers & their engines are thoroughly tested. I wonder if 0W-20 oil has anything to do with it?

 

Ford still uses 5W-30 & I wish GM could hit their mileage numbers with that grade of oil as well 

Ford calls for 5W-20 on the F150 V8 and has for many many years.  The number before the W (stands for Winter) is the cold viscosity rating for the oil.  Both 0W-20 and 5W-20 are 20 wt oils at normal operating temps (210°F). The viscosity has nothing to do with using oil, that's mechanical condition with parts that are on the high end of the tolerance limits.  

 

0W-20 engine oil can reduce the startup load by making it easier to turn over a cold engine and the impact is felt at higher temperatures than most consumers would think,  not simply to what feels cold to humans - warm summers days are cold to an parked engine.  Also these newer engines with Variable Valve Timing and Active Fuel Management operate at peak efficiency with the oem recommended viscosity. 

[Jay Curlin]

My 2017 Expedition with 3.5L Ecoboost V6 twin turbo used 5W-30. That is Ford's most popular engine. If they have moved it

to 5W-20 I stand corrected. Yes, I would never suggest using another grade of oil than recommended by the manufacturer. I'm

simply amazed at the liquidity of these oils today. GM is even running 0W-20 in their new baby Duramax......and with an aluminum

block. Real interested to see how those do at 150,000 miles plus. Reviews are fantastic on that motor

[Z45]

1 hour ago, Jay Curlin said:

My 2017 Expedition with 3.5L Ecoboost V6 twin turbo used 5W-30. That is Ford's most popular engine. If they have moved it

to 5W-20 I stand corrected. Yes, I would never suggest using another grade of oil than recommended by the manufacturer. I'm

simply amazed at the liquidity of these oils today. GM is even running 0W-20 in their new baby Duramax......and with an aluminum

block. Real interested to see how those do at 150,000 miles plus. Reviews are fantastic on that motor

Your are comparing GM V8 engines to Ford's hair dryer V6.  GM calls for 5W-30 in the V6 as well. 

Ford V8 calls for 5W-20 since 2002.

 

 

ENGINE—ENGINE OIL—RECOMMENDED Article No.
APPLICATIONS FOR SAE 5W-20 AND SAE 5W-30 02-1-9
MOTOR OILS—GASOLINE AND FLEXIBLE FUEL
VEHICLES ONLY

 

Testing has validated this viscosity grade can be
used in many previous model year vehicles. It is
recommended ALL vehicles on the following Vehicle
Application Listing be service with SAE 5W-20.
All 2001-2002 vehicles other than those listed in the
“Exception 2001 Vehicles” or “Exception 2002
Vehicles” chart are being filled with SAE 5W-20
motor oil at the factory and should also be serviced
with SAE 5W-20 oil.
 

[RyanbabZ71]

My 2017 Expedition with 3.5L Ecoboost V6 twin turbo used 5W-30. That is Ford's most popular engine. If they have moved it
to 5W-20 I stand corrected. Yes, I would never suggest using another grade of oil than recommended by the manufacturer. I'm
simply amazed at the liquidity of these oils today. GM is even running 0W-20 in their new baby Duramax......and with an aluminum
block. Real interested to see how those do at 150,000 miles plus. Reviews are fantastic on that motor

Camaros run 0W-40 now


Ryan B.

[Transient]

Camaros run 0W-40 now


Ryan B.

Which Camaros? Iirc, there's 4 different engines in that car. Also, there are differences between LT1 and L87, even if the architecture is the same or similar.

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