I bought a 1996 12v 5.9 w 250 k on odo. I was getting 11 towing and 13 allaround mileage with a 4 in exhaust took it to mech to adjust timing and...
wanted to get info on 12valve cummins as I recently purchased a 1996 with 250k on the dash. Took it to the mech for better mileage11 towing 13...
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