Originally Posted by eldoradoboy
I honestly dont think you did anything wrong to the engine... my friend ken runs 5w-30(10w-30 in summer) oil in his 1991 camaro and has since they day he bought the car new... it has a 305 in it now with 185,000 miles on it. that has to be one of the quietest, smoothest running small block chevies ive ever seen.... its so smooth you dont even hear a rhythm to that engine..... oil stick is always full at 3000 miles too..
I beleive your 1991 has roller lifter and not flat tappet lifter as there is a big differance between the 2 and a flat tappet engines requires better oil then 5-30
The oil we recomend has 1582 PPM of zinc and is a diesel 15/40 oil and no isses of premature cam and lifter wear.