any sites showing  oil tests comparing brands for wear, viscosity etc dino oil versus synthetic's.  I read something a few years ago in consumer reports about tests that were done on taxi cabs.  Their conclusion was all oils were the same so buy cheapest one and change it often.  I recently saw something with amsol oil tests for wear whcih showed pennzoil 5w-30w coming in second to their oil and better than other syns.
anyone have any input on this-just asking.
Thanks!