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I accidentally put 6 qts of ATF in my diesel engine. Ran for just a few minutes until I realized what I did. Drained all ATF and replaced with engine oil. What else should I do?
I would run the engine again for a few minutes and then drain that engine oil as it will have any ATF that was still in the galleries.
Then fit a new filter and refill with fresh oil.
After that you should be good to go.