Well I'm now running Castrol 10w40! I still hear the 'ticking' sound a bit, but I'll let it go through a few drive cycles to see if it changes at all. At least I feel a little bit more at ease with the higher weight oil in there.
FYI, Wal-mart is way cheaper on oil than Auto-Zone, and the selection was much larger. I was surprised, but it worked out. $21 for 5qt of Castrol.
Thanks for all the input fellas, and for not turning the thread into an oil dispute!
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