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Type: Posts; User: jlbpa

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  1. I have used pennzoil or castrol. I'll...

    I have used pennzoil or castrol.

    I'll contact the local gm dealer and tell them I think I have excessive piston slap and see if they come up with the carbon buildup remover solution.
  2. Knocking sound when starting...loudest when engine is cold

    2001 k1500 5.3 with 104,000 miles. Started several months ago when engine was started but would get quiet after 10 or 20 seconds. Now it knocks longer and louder but does eventually get ...
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