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  1. R

    DLM 20W50

    I emailed Dave Ward to request an HPL recommendation for an 8.1L engine in a 2009 Mastercraft boat. He suggested DLM 20W50, but I can't find it on their website. Does anyone know what DLM is? Thanks!
  2. R

    Which NO-VII Oil would you recommend?

    I have a 2021 GMC Sierra and a 2021 Toyota Land Cruiser. Both spec 0w20. Which oil below will perform best in the cold? 5w20 or 10w20?
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