Cost vs benefit analysis tells me:
Use a standard good grade of
oil and change it often. I'm not into after market "additives" or "
synthetic" oils in general. The biggest problem I saw as a mechanic were people who like to CHANGE BRANDS of
oil based on what was currently "on sale"!
Whatever you use, STAY WITH IT and CHANGE IT OFTEN! Mixing brands when you change
oil or ADD oil in between seems to be about the worst thing you can do. Or maybe thats just an old wives tale?
Ernie