I run Rotella T 15w-40 Diesel Oil, It is JASO-MA certified and it's an excellent oil, never had any troubles with lubrication, overheating, clutch slipping or anything. Also it's fairly cheap compared to all this "Special Formula" "Excellent Heat distribution" "Pain Relief" You name it they have it, it's all the same stuff in jugs of different prices. Oil is oil, maybe synthetic is better but they used Dino oils for a long time and things are still looking good to me. Oil is oil, it's designed to protect your engine from wear which it should all do or it shouldn't be called oil.
-2007 King Quad 450 (Work Horse)
-1984 Honda TRX200 (Donor)
-1989 Skidoo Mach 1 (Play Toy/Winter Headache)
-1966 Series IIA Land Rover (Major Project)
Last edited by HondaGav; 11-02-2013 at 08:36 AM.