Originally Posted by GonneVille
I don't think anyone on here said that syntheitc wasn't better than conventional, just that the benefits might not be as incredible as some companies make out.
I think the benefits are easy to define, but they're more relevant to some people than others. I'm thinking mainly of the more consistent viscosity at temperature extremes, which would be really useful if you're living someplace like northern Wisconsin and you need the car to start when it'* -27°F outside, or you're doing endless highway miles through Death Valley in the summer.
But if you're just putzing around town and occasionally on the highway in average weather temperatures, I don't know how much benefit you're really going to get in exchange for the higher price of synthetic, plus that kind of driving fits the Severe Service schedule where you're supposed to change the oil more often. My cars run on regular dinosaur juice, with changes around 1500-3000 miles each, and they're doing fine: no sludge buildup, everything looks clean inside the rocker covers, and the old oil is dark brown but not opaque black when it comes out.