My last Toyota truck I didn't Mobil 1 every 10-12,000 miles. Traded it with 196,000 miles, nor problems.

Had the same experience with a 92 Chevy I had for 9 years before that.


These days, since I drive so little, I've be using standard oil and changing once a year. It's all I can do to put 5,000 miles a year on a vehicle.