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  1. Duramax Seventh Generation: 2020+ (L5P)
    I have a 2020 GMC 1 ton Denali with around 27K on it. While pulling my RV to Florida, I got a check engine light. I pulled into a car parts store and they read the code. It was on cylinder #5 and it said the cylinder was excessively retarded. I cleared the code. No more codes the rest of...
    engine codes fuel fuel additive
  2. Duramax Seventh Generation: 2020+ (L5P)
    New to diesel trucks. Suggestions on fuel additives for 2021 L5P?
    fuel additive
  3. Duramax Sixth Generation: 2017-2019 (L5P)
    How many of you run a fuel additive in L5P motor and what type if you do run an additive?
    fuel additive l5p
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