I don't trust an olil that you don't have to change for 7500 miles. I don't care if it says that or not, every 3000 miles is the way to go. Esp. in high milage engines. Heres a tip. This works on old muscle cars but i haven't tried it on anything new. Drain you oil then put tranny fluid in the engine and let it run for five minutes. Drain out the tranny fluid and you'll have cleaner insides. Sinced tranny fluid is oil that is thinner and as a detergent in it to kee your tranny clean, it cleans out the inside of your engine. Now don't try it on a new car you drive all over. Get a junk new car that has a running enegine in it and test it out. The tranny fluid might mess up engine internals in these newer cars.