"best" can mean alot of things to different people. i personally would never consider redline or amsoil to be "best" no matter how good they look, as the price of them is just not worth it to me. not to mention amsoil isnt sold locally, you have to pay for shipping on it too. schaffers would also not get my vote, as you have to mail order it and in good quantity ($200 of it) to get free shipping. that doesnt seem to great to me. so for me atleast, mobil 1 gets my vote. its fairly cheap, $3.70 a quart to the public, its available anywhere, and you dont have to pay for shipping. i chose mobil not because its nessassairly better or worse at protecting my engine, but because it suits my needs best. and coupled with the fact that i can get it for $3 a quart because my sister works at a saab dealer kinda of seals the deal for me. as for dino oil, i use this logic, if its name brand and under 90 cents a quart after mail in rebate, then its good enough for my other cars. i wouldnt really want to use costal oil or warren or other generic brands, not because they are not good enough, (as long as they are API SL they are good enough for me) but because i believe the generic brands tend to skimp on the base oil and add pack, making an oil thats just barely good enough to meet API SL. so as you can tell some people here define the "best" oil by the wear numbers and will go to any length to get the "best". i define the best by which oil suits me.