My warranty is finally up on my 03' 250 HPDI. I've been running Yamalube from the start and just purchased Amsoil HP Injector full synthetic. My oil tank has about 1/4 gallon left in it. Is it OK to mix the two oils?
Feedback on the Amsoil vs. Yamalube. My primary reason for changing was cost $41gal for Yamalube vs. $26gal for Amsoil. Also I feel the full synthetic might give me some added protection.