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It's definitely not normal. My stepdad has a 05/06(can't remember) 5.3L with over 70k HARD miles & it doesn't leak a single bit. You may want to find a forum where people can scoot you in the right direction. I did a bit of research & some people are having the same problem, but it should not use 2 quarts in 5k miles. It could be something wrong with one of your pistons or a ring, but I'm not going to sit here & tell you something that I don't know for sure. Hell, give a few dealers a call & you should be able to find one that will work with you.
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