I have a 1980 ford ranger F100 (full size truck) 300 straight 6. 33 years old, I don't know how many miles but I would guess at least 300,000 and it starts right up at a turn of the key. Also ownd a 72 Ford F150 with same motor (I think) ran that truck till the body fell apart. The motor was still running when I got rid of it. I will only buy Ford trucks for now on.