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I don't understand some people's afflictions with overly heavy oil. Guess that's why I am a member at bob is the oil guy.
For what it's worth, a friend of mine has a 1990 Jeep 4.0. It plugged the oil pump and he drove it home with the bottom end knocking *and* the lifters clacking away. We cleaned it up and suddenly it leaks oil pretty bad now that the oil pump is actually pumping.
The engine was whisper quiet, though, after we fixed the oil pump. Until we dumped in 20w-50 to slow the leak. It sounded worse than my 2000 with either a broken piston or a bad lifter.
My Jeep 4.0 is actually a hair quieter on 5w-20 than anything else.
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