Does anyone use Royal Purple Synthetic Motor Oil in their Porsche? They claim they are better than anyone else in the business and you get better everything by using it too. If that's true, would it be better than Mobil 1? They also claim it will not void new car warranties by using their products because it's API certified. What's your opinions? Here's a link for their product; Royal Purple

 

i'll stick with what Porsche recommended. no second thought– Mobil 1