Yesterday, 12:48 AM
The combination that appears to be working for me at the moment (no drips)...is a new rear main cover plate, Viton seal 48x72x10 (as mentioned in the thread), 1.872-1.878 repair sleeve (as mentioned in the thread), extra breather holes in the aluminum valve chest cover along with a breather fitted to the oil filler pipe, and Comma 20/50 classic oil (maybe a contributing factor, as I was using halfords classic 20/50 oil previously).