Hmmm. I really like the synthetic motors oils, but they are just too damn expensive (coupon or no coupon). Given the choice of changing my oil less frequently with synthetic oil; or, changing my oil more often with regular oil-- I'll choose the latter. Frequent oil changes are the key to long engine life, so economically it's more cost effective to use regular motor oil. Fresh short-term regular oil is way better than dirty long-term synthetic oil.