I just did an oil change on my TJ friday, according the book it had magnatech oil (the previous owner was good and wrote what oil he used) and on start up it rattled and carried on for like 5 - 10 seconds. I dumped that out and put in the Penrite HPR10 based on the recommendations here and now I have no rattles or tappet noise at all on start up, even after having the car sit for 8 hours up in the snowfields on sunday, when she started up not a single rattle.
Guess it proves not every car is the same!
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