I can vouch also for saying if you haven't done it then get it done and do it more regularly. I dropped the pan and did the filter also and there was a film of crap to be cleaned out of that pan. The colour of the oil was scary enough but after 2 flushes it is looking a bit nicer. Photo shows what came out.
And here is what it looked like out of the cooler line.
And here is what it looked like out of the cooler line.
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