I'll keep you posted on my observations with it in my crankcase. So far, I've got about 2100 miles on that oil, and was trying to get to a 7500 mile OCI, but I'll have to muster a lot of willpower for that one, but I will have no problem leaving it in for 5000 miles, as my wife would have something to say about $75 OC's every 3000 miles!!!