I use a Litre of ATF in problem units, I had a 2.7 in a Chrysler that kept logging timing codes, I added 1/2 a litre for about a week then overfilled it, with a liter of ATF and it was driven about 30 highway miles, and the oil changed no more codes. I use it, every fall in my gas unites and my New Duramax. Every time I do a major overhaul, or bearing roll in I would do it, and leave it running while I washed it. I do not recommend a solvent like flush.
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