While I was searching for information about M1 15w50 (may use this during my new cam/lifter break-in) I found a Mobil 1 PDF about it. Seems Mobil 1 0w40 and 15w50 are listed as road and track oils
http://www.mobil1racingstore.com/mo115sin.html
http://www.mobil1racingstore.com/mo10wsin.html
http://lib.store.yahoo.net/lib/yhst-11393728615989/m1racebrochure.pdf (Mobil is using Yahoo as the sales medium)
http://www.mobil1racingstore.com/mo115sin.html
http://www.mobil1racingstore.com/mo10wsin.html
http://lib.store.yahoo.net/lib/yhst-11393728615989/m1racebrochure.pdf (Mobil is using Yahoo as the sales medium)