Hey Guys!

I have been running on 5w-30 regular oilsince I have had my current1986 auto coupe vette....4 years or so. I want to switch to Mobil 1Full Syn. The Vette has 100,000+ Miles,Is this a good or bad thing, or will it be ok to switch? What do you think? Thanks!

 

I say,why not? Switch to Mobil 1 and have at it,as long it's the same weight oil.With higher miles,we all need whatever extra protection we can get,right? Your friend,Joe.

 

Disagree. Yes, synthetic is better but unless your car specifically calls for it or it has been run on synthetic its whole life or pretty close, I would NOT do it because synthetic has alot of detergents in it and once it cleans out all that gunk in there your going to have some serious oil issues because chances are the seals are worn out. I went with penzoil high mileage **75,000 miles and above** oil and have had no problems yet. Also, stay away from crapstrol**castrol** and other cheap brands! Mobil one and penzoil are pretty much the only ones that I trust except amosoil which is too expensive along with mobile one. But its your car, do as you want. Just my .02. [&:]

 

Black86Vette is right, if you have not been running Synth and your engine's manufacturer does not specify it, then I wouldn't run it. YOU WILL develope leaks, synth WILL find a gap somewhere that dino oil may not. If you don't have an LTx or LSx engine then run what was put in it from the factory.

 

If you had started your car out on synthetic, it would be ok. High mileage engines switched to synthetic tend to use oil more becaause it is a little slicker the conventional oil.[8D]

 

One more thing, Synthetic last longer at higher temperatures than dino but if your engine is overheating the oil isnt gunna protect it past a extent so your paying extra $$ that dont need to be spent or could be put better somewhere else![&:]

 

Ok explain this. I have been using Mobil 1 since the mid eighties with no problems. Back in 2001 I bought my daughter a 1991 Chevy Caviler RS 3.1 with 113,000 miles on it. I changed the oil to Mobil 1 today the car now has 175,000 miles on it goes 5,000 miles between oil changes uses no oil and not a drop on the garage floor. My 1988 C4 when I bought it last Oct. with 28,000 on it was due for a change. The sticker on the windshield said next change due Nov, 1999 or 28,500 miles I also used Mobil 1 in it also does not leak or burn oil.
I have used Mobil 1 in Fords, Mopars, GMs and in my Tractor with NO trouble.
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Sounds promising! Did you switch your vette from regular oil ti Full Syn Mobil one?

 

Yes, The service records showed it always had Valvoline.
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Guess your lucky then or it was run on synthetic its whole life.