Been using 5W30 Mobil 1 for over a 100k miles. Repeated over redline driving (7000-7500).....still runs good.
Hector
2003 Rally Red Mitsubishi Evolution VIII
257HP/259TQ
2005 Lapis Blue Mazda 6s
RET: 00 Cabernet Red Ford Contour Zetec ATX SUPERCHARGED
160HP/141TQ