Just got the 94 z28. 110,000 miles on it thought. i would like to switch the oil. other guy was using pissoil (i mean penzoil) i dont really care that much for it. thought i would switch to mobile one. What do you guys recomend and what weight. Also what other fluids do you guys recomend me changing, if so please give brands and wieght. Thanks alot. i appreciate all the information.

 

I recommend Pennzoil

I use 5w30(Pennzoil) in mine. Always have in all my cars and have had no problems. I use a heavier weight in my Honda though. When my supercharger goes on, I will switch to Mobil 1 synthetic.

I would change all the fluids if I were you. Coolant, tranny(auto or stick), and rear end oil.

 

having that many miles on the engine wouldnt be a bad idea to use a 10w40 weight, i use mobil 1 syn, never had a problem

 

I would never run penzoil. It has a bad habbit of gumming up after 3000 miles, especially if the car is in a hot environment. 10w40 might not be a bad idea, but also keep in mind that 10w30 has the highest concentration of crude oil which makes for more durable oil and lubricates slightly better then does the 10w40.

 

my z only has 24k on it and used 10w30 when i first got the car, didnt know about the highest crude though

 

What about 20wx50 is that good or bad, in a Z