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Just an FYI, I had pulled my cooler to get to the oil pump/pan. So it was draining for a few weeks in a bucket. But without pulling it, I'd think doing what you're saying is effective at flushing the cooler itself.I wonder how well it would circulate through the secondary cooler on my mtv. There is that piece people were thinking was a bypass. Guessing I should drain from the return before it goes back into the tranny.