Re: Top end clatter / lifter tick?
Well, this is anti-climatic, but I just started the car... and the noise is gone. Right from startup, the engine sounded fine with a normal idle.
It's been almost a week since I last started it, and it's 37 F ambient here today (perhaps a little warmer than that in my garage.) I don't know if it was the higher temperatures in the last several days, or if the Marvel Mystery Oil actually helped, but I'm quite happy this resolved itself!
I'm sorry I don't have more information about the nature of the problem, but I think we had some good discussion here and I'm quite relieved that this didn't turn into another big car project (as I already have enough of those.)
Colin
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