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I have always used Mobil 1, but for the first oil change I used Royal Purple 5w30. I was curious about their claims of better lubrication & better mileage. Too early to tell if mileage is better, and no way of telling if it is lubricating better...
Mobil 1. I love their packaging-the color of the label and the plastic bottle. And the bottles are designed correctly so that when I pour it into the engine it comes out without burping. The spout is correctly positioned on one side rather than in the center.