Mobil 1 EP now meets gf-4, sm requirements. there's still some sl in the stores but if you look hard for the new bottles you'll see it's rated sm.
http://mobil1.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance_FAQs.aspx#FAQs1


89 Toyota pickup, 4x4, 5spd, 3.0V6
31x10.5 bfg's on 15x8 pacer rims
custom exhaust, k&n air filter