Originally Posted by CivicSiRacer
Mobil 1 used to be labelled SYNTHETIC but now it's labelled TRI-SYNTHETIC. So I don't know what that means.
My Royal Purple or Amsoil is about $8-10/quart compared to Mobil 1 which is about $4
...and thats why you have to keep it in your engine so long! :db:
P.S. - Everyone should check out CivicSiRacer's other post
(HERE) from waaay back. There's some good stuff in there. A little off topic - more related to synthetics than high mileage oil, but still pertinent.

h: