Being from the commercial side of the automotive aftermarket for 30 years, (my god, has it been that long?) I have been told by mechanics I trust, that Syntetics are a worthwhile ugrade. The molecular structure makes for less friction, they don't break down as quickly, and are better for startup. Having said that, you still get the same amount of contaminants no matter what you use. So to get the best of both worlds, use 1 quart of the synethic and regular quality oil for the rest. You get the advantages synthetic has to offer, but since you still need to change your oil every 3-5k miles, you don't pay nearly as much in the long run. Myself, I just by the blended when it's on sale. And I know it's just mental, but the first time I did the semi-synthetic oil change, my 94LS felt like it had some new kick to it.