[hurryinhoosier62]

I’m not really a fan of “flushing” engines, period. Using MMO to free stuck rings and noisy lifters, yes. I’ve seen this work, but most of the cases of flushing engines I’ve seen ended up with other oil related problems in the end. Just put my Silverado back on the road after having to let it sit for three years( couldn’t depress the clutch with a blown out knee). Simple process: drain out the old oil ( full synthetic 10W30), replace with 10W40 synthetic blend with one quart of MMO. Run for 1,500 miles; replace the leaking timing cover ( typical for GM 4.3 V6s in truck applications ), drain and replace the 10W40 synthetic blend with 10W30 fully synthetic.