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  1. M

    Which Oil

    I have a 08 Ford Focus with 7100 miles. I would like to change to Amsoil. Max oil changes would be 7500 miles while in warrenty. I am trying to decide between 0W-20 100% Synthetic and 5W-20 Xl. Are they API certified? Also is the 5W-20XL a blend? Any advantages one over the other?
  2. M

    Amsoil 4 - Stroke Marine

    This is my first post and I have a few questions that you guys can help me with. I am the process of having a new 5.7 Vortec Marine 320 hp carb version installed in my boat. Bolted to a Cobra outdrive. A engine oil cooler has been installed as well. 1. The shop that is doing the install states...
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