I run Royal Purple 10w-30 for the engine and Redline MT-90 in the trans.
Any of those would be fine. Running synthetic is not needed, and IMO is just a waste of money. As for the trans oil, you should run an MTL that is designed for a FWD car. Not gear oil, not motor oil. Something like GM-syncromesch or the royal purple that's designed for cars with manual transmissions that calls for ATF or motor oil.I am going to do an oil change on cujo (1993 900c) and was looking for input on what synthetic oil / regular oil is best for my car. I work at vip and have access to mobil 1, penzoil, Castrol,havoline brands.