My sons 91 Ranger has 335,000 miles all on M1 10-30 with 10to13,000 mile OCIs. Engine is still very clean and uses no more oil than when new. Engine is still very quite. My 85 Escort diesel went 300,000 miles before body let go on M1 10-30 with 10,000 mile OCIs. My old 90 Tempo last I knew was at 256,000 miles on M1 10-30, 10,000 mile OCIs. A friend has a 99 Silverado with 260,000 miles on M1 10-30 with 15-20,000 mile OCIs.
And many other M1 stories of high mileage engines to numerous to mention.
And many other M1 stories of high mileage engines to numerous to mention.