All I know about this issue is I used to have an 04 Avalanche withe the 5.3 L and the heads went to crap after 43,000 miles and I ended up rebuilding the top end of the motor, with some nice aftermarket heads.
If you have milky colored oil I would say you have a problem.
Been looking around the forums for quite a while now! You folks have a great site here with alot of great tips. I just recently used the anti-lok brake fix for the wife's 2001 Yukon XL. worked flawlessly.
Thanks
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