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Surprising Results on “Clean” Engine

Scenario is my wife’s ’99 Grand Am, 2.4L 4 cyl, 60k, the subject of my UOA experiments with different filters. Both UOAs were very good. She bought it used with 29k, nothing but Mobil 1 every 5k since 30k. Just for kicks, I ran some ARX at 60k for 1500 miles. Oil still looked kinda gold coming out. Then the rinse cycle for 2200 miles, both with Havoline 5w-30.

Just finished changing the rinse oil with 2200 miles and it looked absolutely like tar. I’m sold. Now 1300 miles with max life to get to 65k and back to Mobil 1.

—Jon O’Data