Cool! I use Mobil 1 in the summer and Royal Purple in winter and run both until 10,000 and even sometimes 14,000 and my engine at 130,000 miles with my foot in it every single mile is in pristine condition. Blackstone says my Mobil 1 holds up better than my royal purple by a tad but both still had 2-3k miles left in them for the most part.