Well I have been using Mobil 1 in my car since around 20,000 - 30,000 km and I am now at 293,000 KM and have never, touch wood, had any problems at all. I don't even burn oil.
1998 BLK SVT CONTOUR
#2980 of 6535
395,000(ish) km (and counting)
SVTOA-TORONTO
Chapter Director
www.svtoa-toronto.ca