QUOTE (wbw @ May 12 2010, 08:05 AM)
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Today's regular oils are so much better than the oils of 30 years ago. I don't think you can't go wrong with any major brand oil, regular or synthetic.
+1 on that!
Car engines, and oil, used to be horrible compared to today's engines and oils.
Engines were machined on huge, manually controlled machining centers, and the
cylinder walls came out rough and not truely round. They required a "run-in" period
to lap them smooth. Thin, slick oil would blow past the rings, and slowed the running
in period. After the run-in period, thinner oils stayed in the engine better.
None of these problems exist today. Engines are precision machined. Materials are
better. Oils are much better, both regular and synthetic. You can use your oil of choice
from day 1.
It's still advisable to stick to manufacturer's recommended oil change intervals, because
of filters and warranty requirements. That may change some day, I hope!