Joe, I have ben running Mobil1 Synthetic oil in my cars since forever. :-)
Some claim that it may help prevent oil burning. I use the same viscosity as
OEM 5w30, yet I still religiously change my oil every 3000 miles to keep the
engine happy.

Twin cams were notorious for burning oil but not everyone had that problem.
It is not a very common problem with single cam engines.

Also check out www.saturnfans.com, lots of nice helpful ppl there too, some
of whom are here too.

marx404