I have a 93 z with 96,xxx on it and it needs an oil change. Should i put the regular valvoline 5w-30 or should i put the synthetic. I bought the synthetic but I don't know if this would be a good idea the more i think about it. My neighbor runs it in his 99z but its the ls1 and thats all its ever had in it. So should i flush out the oil with a cleaner and use synthetic or not?

Thanks

 

yea its not a good idea. If the car has got sythentic since the day the motor first started it would be fine, but since its got higher mileage and ran regular oil, just stick to regular oils

 

Hey Thanks A Lot!

 

i switched over to syn. at 128k and had no probs whatsoever

 

Same here with me. I switched over right around 93k on my '93 and I've been leak-free ever since. I too was scared but just go with it man. If it leaks, use regular oil on your next 3k change.

 

I wouldn't switch. It costs more and you may jeopardize your engine. Just stick with a good quality 5w or 10W 30 or 40 and change your oil regularly.

Why take a chance--you're not gaining any power anyway. JMHO

 

Well everyones all synthetic this-synthetic that... These engines have run FINE on dino-oil... just stick with it, not worth the problems.