Oil for (modified) supercharged 3800 ?

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Jul 14, 2025
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Hello all!
So I am a new member and I signed up because I'm looking for a good recommendation to replace my former oil. So in my twenty years of car maintenance i have Always used Havoline oil products, now it seems its becoming very difficult to find my oil of choice and I guess I have to switch. I have a modified supercharged 3800 engine. in searching for a new oil I keep that in mind.

Also i have heard that with all things one company makes many oils and they just change the label as it goes down the line, I'm curious which companies do make mulitple variants of oil like i know Havoline is actually made by Chevron and they also make Delo and Techron oil.
 
Hello all!
So I am a new member and I signed up because I'm looking for a good recommendation to replace my former oil. So in my twenty years of car maintenance i have Always used Havoline oil products, now it seems its becoming very difficult to find my oil of choice and I guess I have to switch. I have a modified supercharged 3800 engine. in searching for a new oil I keep that in mind.

Also i have heard that with all things one company makes many oils and they just change the label as it goes down the line, I'm curious which companies do make mulitple variants of oil like i know Havoline is actually made by Chevron and they also make Delo and Techron oil.
The oil's that you listed are a joke IMO. Look for a good Euro spec oil from either:
Amsoil
Mobil 1
HPL
 
I'm sorry i have no idea what that is. I guess i should have said its a GM 3800 it calls for 10-30 oil
I imagine you have a 90's to early 2000's 3800 and it calls for conventional 10w-30 which isn't great but serviceable since these seem to last either way. Any modern conventional gasoline or diesel 10w-30 will still be better than what it was meant to get decades ago but something a lot better isn't that much more.

Get a euro rated oil like mobil 1 0w-40. I'm using quaker state and castrol 5w-40 at the moment in two newer engines one being a gm 6.2 since I got them on sale and they're great and pretty much all of them are these days even the "worst" ones that have oem approvals. I'm using 15w-40 in my old 5.3 and 6.0 and they love it.
 
Some years ago one of the oil companies offered free oil with free UOA, I ran the oil in this this engine that was also modified and had wear problems. This was one OCI on 5w30, luckily it didn't lose the bearings, after talking to someone at their sport division and told them what the engine had for parts in it the guy said you cannot run xw30 in that engine and to run 0w40 or 5w40.
On Mobil 1 0w40 the numbers dropped like a stone.
GP L67 UOA.webp
 
I suggest any brand of Euro approved 5w30 that's available at Walmart website, or Pennzoil Ultra Platinum 5w40. PUP is thin per grade. So 5w40 PUP will only be slightly (if any) thicker than a Euro approved 5w30, especially considering that Euro oils run thick per grade. Euro approved 0w30 would also be good and (depending on brand) might be thicker than Euro 5w30.
 
Some years ago one of the oil companies offered free oil with free UOA, I ran the oil in this this engine that was also modified and had wear problems. This was one OCI on 5w30, luckily it didn't lose the bearings, after talking to someone at their sport division and told them what the engine had for parts in it the guy said you cannot run xw30 in that engine and to run 0w40 or 5w40.
On Mobil 1 0w40 the numbers dropped like a stone.
View attachment 289463
You talking about Gena Fishbeck from Pennzoil? I got in on that deal too....
 
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