Join Date: Oct 2006
Location: North Texas
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ATF is extremely detergent--much more detergent than motor oil. Crud builds up inside the engine, especially when folks don't change it often. By adding some ATF you are increasing the detergent and the crud will slowly dissolve away into solution and be captured by the filter. You change the filter more often.
Several years ago a friend acquired a car with a badly sludged engine. In this case it was going to be way too much trouble and too costly to actually disassemble the thing, so it got 3 quarts of oil and 1 quart of ATF. At 300 miles I replaced the filter, cut the old one open and showed him the crud that had collected. Changed it every 300 miles until the engine was cleaned out--and maintained the 3:1 ratio between oil and ATF. In about 4k miles it was as clean as it was going to get which was pretty clean. With a low mileage engine you might not need to do this, with an mid range it can help to dump some ATF in a few miles before changing oil. High mileage engines frequently are gooped up to the point that it can take a lot of work to get them clean.
2007 V6 Camry LE, Built TMMK 27 September 06
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