craftsmen22

I am going to do a oil change. And therefore I wonder whats the best oil to get for my 69 Cutlass conv. 350 engine? It has been rebuilt and hardened seats. In the oldsgroup of google is a discussion going on about zinc in oil. So it came to my mind before I do the change job.

Olds64

I've heard the diesel oil Rotella T is a good oil to use. It is supposed to cut down on all of the sludge build up in an engine if used consistently.

joe_padavano

Unfortunately, Rotella and the other diesel oils are also going through a zinc reduction. There are now vendors selling both additives and motor oil that puts it back in for older cars.

csstrux

I use Rotella 15/40 in everything I own.

OLD SKL 69

You can order cam break in lube that contains enough zinc additive from summitracing.com that you can add to any oil. Competition cams part # CCA-159. $10.25 per bottle. Add one per oil change and get the proper zinc you need for your flat-tappet camshaft.

jensenracing77

if your engine is not new and is broke in, all you need to do is go with a good brand. the lower zink is bad for breakin but other than that you will be fine. that is also if you don't have a extra high lift cam. but i will agree that rotella t will be fine to use and it does have more zink than gas oils.