I e-mailed XM and ask them if their M1 EP oil warranty was for a pre determined set of miles like Valvolines is, 300,000. There reply " Our warranty is based on any time that you utilize the product that you will not have an oil lubrication related failure, it does not matter how many miles you have on the vehicle;. So that seems to be an easier warranty to follow, 15,000 mile OCI verses 3000 for Valvoline. Of course they exclude extreme conditions like heavy dust, racing, commerical use, etc. With that said I think oil company warranties are pretty much useless, but I could be wrong.