I ran 20w50 dino oil for a while. Then I switched to 15w50 Mobil 1.... Now I am leaking oil .

Synthetic is great though.

 

Personally I will never use synthetic again. I ran dino oil for a long time in my old ca18det with no problems.
I then decided to switch to synthetic because everyone was telling me how great it is, well long story short it ate through one of my piston rings The synthetic brought foward a problem that the dino oil was hiding but I'm positive if I would have stuck to dino oil I would have gotten ALOT more miles out of that engine.
I learned my lesson, I plan to never make a high milage engine switch over to synthetic or any engine for that matter just to be safe :o

 

Ok i switched to Mobil one full synthetic first i bought some Engine Flush and did what ever directions said then bought a k& n oil filter and switched to mobil 1 full synthetic 10w 30

 

that is what iam using...plus walmart has it for cheap heh