Thanks for all the replies guys I appreciate all of your opinions. The motor is a v6 231 buick rwd from 85, and I am not sure if it is roller or flat tappet. The oil viscosity that is recommended in the hand book is 10w30, and I live in kings county where the winters are near freezing and in the...
So I got a motor currently at the machine shop getting rebuilt. It is a Buick 231 evenfire engine from 1985. The engine is about 2-4 weeks from completion and I am curious as to what synthetic motor oil you guys would think would be the best to give the motor the longest life span possible. It...