Which oil?

The VR1 will have much fewer detergents conpared to the Rotella, so you may need to change the oil more often. One thing you can do to make sure is to send off a sample for a used oil analysis (UOA). If you switch to the VR1, send off the used Rotella and they will tell you if it was doing its job or not. Then once you get through your first fill of VR1, say 3000 miles, you can send that oil to be analyzed and go from there. They'll tell you exactly what's going on inside your engine. I keep a sample from every oil change, and send one off every other oil change. It's the only way to know for sure.

http://www.blackstone-labs.com/