Walmart has mobil 1 full synthetic 20w 50 for v twin for $22 a gallon or 6 a quart. I bought the same oil at cycle gear for almost 12 a quart. I just put in repsol 15w 50 it is a little better for the cold weather. I think it was 13 a quart. before that I had Motul at 55 a gal.