With so many different Brands of Oil and Weights which one is the bestThumbUp? How long (by time, Oil Changes or Mileage) should one wait till they start to use synthetic Oils:Shrug:. And by adding the extra weight and drag of the CSC Cobra XL do I need to modify my oil change interval, type of Oil, weight of Oil and should I be using standard Oil or synthetic's now:Shrug:. I just want to insure that I don't Violate a Warrenty on my GW for something like an Oil filter type, or weight of Oil or even standard or synthetic Oil'spoof.