Looking for a full synthetic 10W60? Own a BMW M3 or M5 and can't find the TWS (Ten-W-Sixty) at a reasonable price? If you check www.bmwusa.com you will find that BMW advises that for 1999 and later models of M3 and M5, it is acceptable to use a 5W30 synthetic motor oil meeting API Service SH or better. Royal Purple's oil exceeds the API Service SH and is rated API SJ. You can also try Royal Purple's R21 for the "race" version of the same oil. This oil is priced at $6.67 per quart. 12 quart case.