[flash968]

chicks - actually i send my oil to blackstone every other change.

as i said, i was quoting that article, and happen to agree with it, for all intents and purposes. i can't help that you disagree.

again, on a street car, what oil you choose to run is less important than it being clean. you will never see the temp limits of any oil on the street. it really comes down to how often you want to change it. running a multi-viscosity dino oil requires more frequent changes in order to maintain the upper range of viscosity. it works just about as well, when it's clean. synthetic oil will work well longer, thereby allowing less frequent changes (on average 3 times less under the best conditions). so, unless your dino oil is less than 1/3 the cost of the synthetic, it is cheaper to use synthetic, if only by the cost of filters and rags.

as for viscosity, on the street, there is absolutely no benefit to running a 20/50 over a 10/40, and it in fact will likely cause higher operating temps, cost you fuel, and provide less protection during startup. if you track the car, you may need the extra temp protection of a 20/50.

like i said, i used to be a bit of a dinosaur myself when it came to oils (what can i say? i'm old). it wasn't until i had a long sit down with an oil engineer that i was set straight. as it turned out, he was absolutely correct.