You can't find 0w-40 around here. I use the 30. Or 5w-30. I agree there are other synthetics that are just as good. If you are sure your dealership is using the right oil then that is all you need. Most don't. They use bulk oil. And by top sider I was referring to the fact our filters are on top the engine. YES dealerships are familiar with this but smaller shops are not. O rings have to be just right as well as seating the filter.