Dino juice

The critical factors are 1) regular changes (this will do more than any amount of additives to ensure long engine life), 2) ash content (less ash means less deposits, which means less grunge to clog up the oil passages), and 3) breakdown temperatures. Cheap dinojuice will breakdown at lower temps, which means that it may not be optimal for aircooled motors.

Originally intended to relieve the Corvette for the need to have an oil cooler, and to improve fuel economy numbers on the EPA test, it's really caught on. Given the investment cost of a modern high end automobile it baffles me how auto makers can justify sticking customers with dinojuice just to save a few bucks.

no, it really doesn't... just as the oil producers add compounds to help seals "swell" to control leakage, the synthetics contain much of the same in the way of additive packages as the dinojuice.. If a seal is *already* leaking it can appear worse due to synthetics somewhat smaller molecules in it's base...