When should I start using synthetic oil??

[SilverGlow]

Originally Posted by 1stToyota

If it's not needed in cars, just jets, a UOA result will be no better than dino, always, because it's just hype and an overkill to use synthetic...or it does provides better protection and will almost win in a UAO showdown...

You are forgetting one fact:

Synthetic will allow you to go LONGER between oil changes then conventional, and that is reason alone to use it. It can also provide 1% to 2% higher MPG too.