Surest way is to not put any oil in! -- Dave G KK7SS Richland, WA '59 Morris Minor 1000 - working on it.. '65 Sprite - running with a bad valve guide :( '76 Midget - co-owned with #4 Son :) '06 Honda Civic Hybrid ----- "Jess Power" <jessmd1 at comcast.net> wrote: > I want to prevent the rear main seal from leaking.