i got a 94 z28 with 90000 miles and i want to know what kind of oil to use for engine, tranny and everything else that requires fluid or oil that i cant think of.

 

most people like mobli 1 syn, i would use 10w30 because of the mileage on yr car, you can use mobil 1 products for all yr car needs, ive used mobli 1 syn and never had a problem

 

If the car hasn't been run on synthetic oil, then don't change to synthetic. All you will do is cause an oil leak.

 

now why would changing to syn cause a leak?

 

Why?

Because synths have rather powerful detergents in them. Any deposits that are helping the gaskets seal may no longer once synth is used.
If you don't have a leak, then you may not have one using synth. One thing is for sure though.... if you already have a small leak, it's only going to be worse.
Might want to change to a synthetic blend... see if any leaks pop up, if not... then change to synth next oil change.

-Mindgame

 

good answer

 

hey, i run 5W 30, if i switch to 10W 30 will i notice ne difference and should i do this change? i have a 95 a4 w/ 122,xxx on it.

thanx,
jake

 

yeah i would with that amount of mileage, maybe even 10w40, give ya a little more oil pressure to

 

I use Castral Synth Blend 5w30.

 

Should I worry about that with Tranny fluild aswell?????

 

i would think the same thing applies, if you have no leaks or tranny problems i would

 

defintly run fully synthetic