And all this time I have been buying Royal Purple at nearly $14 a quart. I have to admit though my Vmax shifts very smooth and the engine is quiet with the RP oil. I only put about 1K miles a year on the bike so I only change the oil once a year. This is going to change now that I no longer pay child support or dependant coverage saving me a ton of money. I can now spend the nice days riding instead of working overtime to support a dead beat exwife.