Q: Lifters knocking on a 2007 GCM Sierra
I have a 2007 GMC Sierra with 5.3 liter. It has a 153,000 miles on it and every once in a while, I start hearing one of the lifters start knocking. I've changed my oil regularly with 5 quarts of GTX and 1 quart of Lucas oil stabilizer. What should I do?
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