D> AutoZone has a brand called 'ValueCraft'. What manufacturing differences
D> exist between something like that (the cheapest in their store) and,
D> say, the major brand names?
Literal answer I don't know. If the package doesn't tell you, it could
be almost anything. Could be old product Shell one can, old product Union
oil in the next can. If it doesn't say on the package my bet is that the
folks at the AZ store won't know any more than you would. I like to stick
with what I KNOW is good.
D> And in another forum I saw someone get really DOWN on the Pennsylvania oils (Quaker State, Pennzoil) as awful.
D> What's the bias there?
Sure and I share the bias against paraffin based oils. (Pennsylvania).
If you have ever seen engines torn down you would too. They gunk the hell
out of engines. Especially I would never use it in a modern high rev
engines. They deposit sludge everywhere. Which is why I like the synthetics
so well. With an older car like your eldo, where you have been using
conventional oil, stick with it, but stick with the majors. Texaco, Union,
Shell, Phillips etc. Just be consistent. Avoid the cheap oil unless your
motor is shot.