Royal Purple sucks! I put it in my f150 because it was supposed to so much better than conventional oils. Well it caused my valve seas to leak and dry up, it caused my spark plugs t accumulate about 1/4inches of ash on each spark plug( 8 total). I went back to Ams oil and it resealed it all and no more ash deposits!!! So Ams oil is all I run now in all of my vehicles including my Buell XB12SS primary and engine.
All buyers beware Royal Poople can cause serious problems!! They are not considered a big oil company so they do not have to stick to the same guidelines as the rest of the companies!! Rogue Oil!!!!!!!