Well, there's definitely some very light varnish but my gut is telling me to just keep doing what I'm doing.
I was able to get the borescope down to the crankshaft through the driver's side timing chain. The visible oil had 5k on it and just got dumped as part of an oil change today.
Again for the record, 220k miles, oil changes every 5k save for a couple that went to 7500 as a test. First ~155k using TGMO 0w-20 (produced by Mobil, I believe), after that mostly Pennzoil Platinum 5w-30, then some Mobil1 5w-30. I'm running 5k on M1 0w-40 to see what that does for the occasional rhythmic valve tap that I get.
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