In put on 351 Windsor motors

[Lynn]

Probably will get about 100 different opinions on oil if you ask 100 folks. Can you still contact the previous owner? If you pull a valve cover and it is good and clean, then contact po and see what he was using. Fastidious guys are usually very brand loyal. It is more a matter of personal preference than anything else, but still very safe to use the same brand he was using. If you continue with the same oil and it is low on zinc (and almost all are), then find a zinc additive, something like GM's EOS (Engine Oil Supplement), and put in about half the can with each oil change.

If you don't know what kind of oil he used, or if by some chance, he was having it changed at a "quick lube" place with "whatever", then my PERSONAL preference is Redline. No additives needed. Drawback is it is difficult to find, but you can buy it from Summit. About 8 bucks a quart plus shipping. I use it in my daily driver (745i turbo with increased boost). Lots of guys on here and other knowledeable websites like other synthetics. I am sure there will be no shortage of opinions.

[markjohnson]

Oil is such a controversial subject these days that I don't know what to even think anymore. I'll stand in the back of the auto parts store for almost an hour reading their bottles trying to make a decision. I tell 'ya, one of my motorcycles has a strict rule in the owner's manual to NOT use any oil that says "energy conserving" in the round approval circle on the back of all oil bottles. Street car oil has really gone down the tubes thanks to the EPA stepped in to tell them how to make oil and what they can and can't use as additives these days.

[ANDY M]

Shell Rotella. Best oil for the price, available anywhere.