5W50 Mobil 1 Supercar
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From: Venice Florida
5W50 Mobil 1 Supercar
Time for first O/F change, given GMs current issues with 0W weight oil and 6.2 failures, decided to use 5W50 Supercar as alternative.
Owners manual lists it as acceptable.Walmart , (my usual go to for oil), doesn’t stock, located it on Summit.
Anybody else using 5W50 Supercar?
Owners manual lists it as acceptable.Walmart , (my usual go to for oil), doesn’t stock, located it on Summit.
Anybody else using 5W50 Supercar?
Thread Starter
Pro
Joined: Nov 2001
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From: Venice Florida
Race Director
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Time for first O/F change, given GMs current issues with 0W weight oil and 6.2 failures, decided to use 5W50 Supercar as alternative.
Owners manual lists it as acceptable.Walmart , (my usual go to for oil), doesn’t stock, located it on Summit.
Anybody else using 5W50 Supercar?
Owners manual lists it as acceptable.Walmart , (my usual go to for oil), doesn’t stock, located it on Summit.
Anybody else using 5W50 Supercar?
It does suggest though that GM thinks the 0W-40 offers more protection than 0W-20 in those engines - and also that its not harmful.
Burning Brakes
Joined: Nov 2022
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From: Western Mass
From the track prep guide. Note that it says 15W50 for track use. In my opinion, the "must change back" is for EPA fleet fuel requirements. I run 5W-50 all the time.
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Drifting
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. FLUID LEVELS CHECK ENGINE OIL LEVEL If the vehicle is used for track events and competitive driving, the engine may use more oil than it would with normal use. Low oil levels can damage the engine. Check the oil level often and maintain the proper level. 0W-40 dexos2™ engine oil is approved for both track and street use. 15W-50 full synthetic engine oil may also be used for track use, but after track use must be changed back to 0W-40 dexos2 for street use.
From the track prep guide. Note that it says 15W50 for track use. In my opinion, the "must change back" is for EPA fleet fuel requirements. I run 5W-50 all the time.
From the track prep guide. Note that it says 15W50 for track use. In my opinion, the "must change back" is for EPA fleet fuel requirements. I run 5W-50 all the time.
15W-50 is approved for track only and directed to change it back to 0W-40 for street use.
5W-50 is not approved oil for the LT2.
You can do what you want to your own vehicle. But it isn't an accurate statement to say 5W-50 or even 15W-50 for street is acceptable per the manual. That is misleading others into thinking they are maintaining their cars within GM's standards when it isn't the case if they so choose to stick with the OEM specifications.
Last edited by chevyrules727; Mar 6, 2026 at 04:33 PM.
Burning Brakes
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From: Western Mass
I never said that. I posited an opinion on its use and reasons thereto. Good enough for high rpm and high temp track use, good enough and I dare say, better for long term engine life and health. The key attribute is the 50 weight not the 15vs5 weight between the two. Unless your using your car in -30 degree weather. Your car, your choice. Cheers.
Last edited by Mark9; Mar 6, 2026 at 04:37 PM.
Drifting
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I never said that. I posited an opinion on its use and reasons thereto. Good enough for high rpm and high temp track use, good enough and I dare say, better for long term engine life and health. The key attribute is the 50 weight not the 15vs5 weight between the two. Unless your using your car in -30 degree weather. Your car, your choice. Cheers.
But it is still wrong to say it is acceptable per the manual as the OP implied.
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5w50 is for the C8 6.2. Given the warm weather here in Florida I don’t think any zero weight blend is necessary.
Drifting
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5W-50 is only approved in the manual for the LT6.
Le Mans Master
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5W-50 for the LT2 is still not an approved oil in the manual. You can use it if you like, not saying not to. But it isn’t an accurate statement to say the manual says it’s ok. That could lead someone who wants to stick to the recommended oil weights to do something wrong.
5W-50 is only approved in the manual for the LT6.
5W-50 is only approved in the manual for the LT6.
If you can run 15-50 you can run 5-50, stop being a pinecone and put the manual down…
I’d never run 0-40 in this car.
Drifting
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Just don’t say it’s approved in the manual and I’ll stay quiet.
I’m not here arguing don’t do it. He made a statement that using 5W-50 is an approved oil for the LT2 in the manual. That’s wrong. Simple as that.
As I said, your car you can do what you want.
Le Mans Master
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From: Your Sister's Bedroom
15W-50 is only approved for track only.
Just don’t say it’s approved in the manual and I’ll stay quiet.
I’m not here arguing don’t do it. He made a statement that using 5W-50 is an approved oil for the LT2 in the manual. That’s wrong. Simple as that.
As I said, your car you can do what you want.
Just don’t say it’s approved in the manual and I’ll stay quiet.
I’m not here arguing don’t do it. He made a statement that using 5W-50 is an approved oil for the LT2 in the manual. That’s wrong. Simple as that.
As I said, your car you can do what you want.
What exactly do you think happens if you run it on the street? Your engine gonna blow up?
I’ll tell you…. It will offer your engine better protection and have a negligible negative impact on fuel mileage…
The factory oil recommendation is about fuel mileage, not protection.
Drifting
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tRAcK OnLY!!!!
What exactly do you think happens if you run it on the street? Your engine gonna blow up?
I’ll tell you…. It will offer your engine better protection and have a negligible negative impact on fuel mileage…
The factory oil recommendation is about fuel mileage, not protection.
What exactly do you think happens if you run it on the street? Your engine gonna blow up?
I’ll tell you…. It will offer your engine better protection and have a negligible negative impact on fuel mileage…
The factory oil recommendation is about fuel mileage, not protection.
If you want to use 15W-50 on the street, have at it. I’m not saying bad things will happen if you do.
But don’t come here and say it’s an approved oil per the manual or 5W-50 because the manual only says it’s ok for track use only or in case of the 5W, only for the LT6.
That’s all I’m getting at.
Burning Brakes
Joined: Nov 2022
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You are correct. But I’m skeptical about GMs “requirements” especially after the 6.2 debacle. Which is still going on. The 40 weight oil sheers down to 30w pretty quickly. If the same holds for the 50w it will sheer to a 40w oil quickly to. For those that push their cars I would recommend the 5w50.
Drifting
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You are correct. But I’m skeptical about GMs “requirements” especially after the 6.2 debacle. Which is still going on. The 40 weight oil sheers down to 30w pretty quickly. If the same holds for the 50w it will sheer to a 40w oil quickly to. For those that push their cars I would recommend the 5w50.
Not arguing on the basis of GM knows best and you will destroy your engine if you do. Just trying to stick to 100% accuracy to what the manual says and doesn't say. Simple as that.
You're right, Supercar 5W-50 sheers down to a 40 grade fast. I only put 750 miles on my Z06 last year and it already sheered down to a 40 grade.
The debacle is due to manufacturing defect. GM recommending 0W-40 now is simply a bandaid and the cheapest solution instead of dishing out the money to replace every 6.2 liter out there. Who knows they might still have to. But who knows if it is just a manufacturing defect. It could very well turn into the LS7 valve debacle.
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I make no comment about using 5W-50 in Stingray. But the language about switching viscosity does not seem to appear in later versions of the track preparation guide.
https://www.chevrolet.com/content/da...2677d63e6a6e9c
https://www.chevrolet.com/content/da...2677d63e6a6e9c