0w20 or 0w30 for Turbo Charged GDI Engines?

[zogg]

My wife recently bought a new 2025 Chevy Blazer. It has the 2.0 direction injection four cylinder with a turbo.

Factory spec is 0w20 which I assume she got when the dealer did the 1st oil change as a freebee at 4,000 miles. I changed it once at 8,500 and again at 12,300 miles, both with 0w20 Valvoline Dexos oil and an AC Delco filter.

After reading lots of stuff on this forum, I’m thinking that the 0w20 is more for cafe requirements than for longevity. Assuming the turbo generates a lot of heat, I concur with the 0w for quick oil pressure in startup but I’m doubtful that the w20 is heavy enough to do the job.

I’m anticipating going to a 0w30 next change. Seems to me this is a better choice given summer heat and a turbo.

I know it’s not the “recommended” grade but can that be determined by the dealership in case of a mechanical engine issue? I kinda doubt it.

Again, due to lots of forum posts, this seems best for the engine, timing chain, turbo, etc.

Any advice is certainly appreciated. Thanks

 

[TomYoung]

You will get many opinions on this, which you may not know is an age-old question. The simple truth is that your mileage benefit for using the thinner oil will be negligible, as will any engine longevity or durability benefit from using the heavier oil. You will do fine either way. Personally, I am okay with thinner oils and will generally follow my owner’s manual suggestions. Good luck.

 

[RedEnsign]

Any modern engines blow up using 30 or even 40? From the last big data set on tmog, 20's fine until they fall out of grade (fuel dilution,time), then wear metals go way up. With a higher grade, you have more of a safety net. A lot of 0w30's, especially the euro specs, are made very well now, with turbo/gdi in mind. People use with confidence.

 

[Danno]

As it is under warranty, I would use a Dexos1 Gen3 approved oil.

 

[tblt44]

I would run penzoil ultra platinum 0w-20 for now

 

[BobsArmory]

You could stay with 0W-20. Go thick with Mobil1 ESP 0W-30. Or go somewhere in the middle with Mobil1 AFE 0W-30.

Mobil1 AFE 0W-30 is a Dexos approved oil and I am confident that there is no dealership that will be able to tell the difference between it and a 20 weight when they pull the drain plug.

 

[CKN]

I tow a 5,000 pound travel trailer up 10,000 foot mountain passes running 0W/20 in my 2023 Silverado (5.3) @90 degree ambient temperatures. Pretty sure your vehicle will not see those conditions.

That's what the manual states-that's what it gets.

 

[Japanese]

I’m anticipating going to a 0W-30 next change. Seems to me this is a better choice given summer heat and a turbo.

Go for it!
The turbo will feel gooood.

Mobil 1 ESP 0W-30
Castrol Edge Euro 0W-30 LL
Valvoline Euro 0W-30
Pennzoil Euro LX 0W-30

 

[WarEagle]

From what I’ve learned and seen here, there are only positives to bumping up a grade. 20 may be just fine, but why not bump to a 30?

 

[Nessism1]

I would use 30 weight. The warranty worry shouldn't drive the decision. Manufacturers don't do UOA's on customers' oil.

 

[anndel01]

Stick with what the owner's manual states.

 

[CKN]

I would use 30 weight. The warranty worry shouldn't drive the decision. Manufacturers don't do used oil analysis on customers' oil.

Not true. GM Techs state under certain circumstances a used oil analysis is ordered before a motor warranty replacment.

 

[facility1]

0w-20 or 30 would be fine as long its dexos gen 3, SQ-GF-7, Valvoline Extended Protection would be a good choice or other flavors at Walmart.

 

[SugarMouth]

That would do well with Kirkland 5W-30 dexos1 Gen 3 it's whole life.

 

[tired]

It has the 2.0 direction injection four cylinder with a turbo.

You're going to get a lot of opinions in this thread. Everything from Kirkland is fine on up. You're not going to get a consensus, so you're going to have to choose.

I think you'd be really smart to run either Valvoline Restore and Protect from day 1 in 5W-30 or a solid Euro offering like Mobil 1 ESP 0W-30 or Mobil 1 FS 0W-40. These small GDI turbos trash the oil and puke gas into the oil. It's going to get diluted out. We see so many cases of gummed up piston rings and oil burning here. Save yourself the trouble. Run Valvoline Restore and Protect or an excellent MB 229.5/229.51/229.52 oil from day 1. Run it 5000 miles and forget about it. It's cheap and off the shelf at Walmart.

Your other option is to run AMSOIL. I think that's a great choice too and would allow longer drain intervals.

 

[Nessism1]

Not true. GM Techs state under certain circumstances a used oil analysis is ordered before a motor warranty replacment.

Unlikely. Extremely unlikely. And not for a difference of one grade

 

[CleanSump]

What the owners manual states.
You're going to get a lot of recommendations that aren't what the owners manual states from individuals who aren't attorneys, haven't read your warranty, won't represent you in a warranty dispute, and won't pay your bill when you lose for not following the owners manual.

 

[Mainia]

I would use 30 weight. The warranty worry shouldn't drive the decision. Manufacturers don't do UOA's on customers' oil.

Some ask for oil receipts.

 

[Faawrenchbndr]

My wife recently bought a new 2025 Chevy Blazer. It has the 2.0 direction injection four cylinder with a turbo.

Factory spec is 0w20 which I assume she got when the dealer did the 1st oil change as a freebee at 4,000 miles. I changed it once at 8,500 and again at 12,300 miles, both with 0w20 Valvoline Dexos oil and an AC Delco filter.

After reading lots of stuff on this forum, I’m thinking that the 0w20 is more for cafe requirements than for longevity. Assuming the turbo generates a lot of heat, I concur with the 0w for quick oil pressure in startup but I’m doubtful that the w20 is heavy enough to do the job.

I’m anticipating going to a 0w30 next change. Seems to me this is a better choice given summer heat and a turbo.

I know it’s not the “recommended” grade but can that be determined by the dealership in case of a mechanical engine issue? I kinda doubt it.

Again, due to lots of forum posts, this seems best for the engine, timing chain, turbo, etc.

Any advice is certainly appreciated. Thanks

Whatever oil you end up choosing I would highly suggest an oil change interval of 5K or less. Direct injection engines have the fuel dilution issues

 

[randomhero439]

I suggest using your favorite brand oil with whatever meets the manufacturer’s specifications (Dexos1 Gen 3). You're doing a good job by changing it frequently to avoid degradation and maintain high oil cleanliness. Clean oil is going to do more for the longevity of the engine than any brand or viscosity is going to do for it based on your expected usage.

It’s a 2025 vehicle, and 20 grade oils have been around for more than 20 years. Have a little faith in the manufacturer of your vehicle that they validated the oil component of the engine to meet the manufacturers design requirements and consumers expectations for long term reliability. After all, they are willing to warranty any engine failures caused by an Dexos1 Gen 3 oil for 60,000 miles!