Originally Posted by 55CrushEm
A co-worker of mine got me onto synthetic. I always used to think it was a waste of money....cause you still had to change it as frequently as conventional, due to it getting dirty.
Anyway, he has a Toyota 4-Runner with 337,000 miles on it (yes, THREE hundred thirty-seven thousand) miles. And he swears that since day one, he's only been changing his oil every TEN thousand miles.
This is true which is why I don't buy into the 25k thing with AMSoil. The oil may maintains is lubrication, but the "dirt" that mixes into the oil over time still causes friction. I'm comfortable pushing it to 7500 miles. Recommended interval on my 35 is 5900 miles.