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It sounds to me like a typical top end noise. My guess, and that's all any of us can give you without digging in deeper, is that it's a lifter/valve noise.
Edit: I just read that it went away. If, indeed, it was the Marvel Mystery Oil, then most likely your original problem was a stuck/collapsed lifter. (Although I have no idea why it would have advanced into a rumble)
Great news that the noise is gone, though!! :dance:
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2002 Boxster Base - Arctic Silver - Tiptronic
2010 Subaru Forester
1980 Ford C-8000 Custom Cab Emergency-One Fire Truck
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Last edited by piper6909; 07-26-2020 at 05:27 PM.
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