2007 cayenne 3.2, I had it serviced when under warranty at the dealer and at random places since. Always full synthetic, Changed at 5-6k intervals, but who knows which weights were used. I think it calls for either a 0w-40 or 5w-30. Little under 200k miles, and still running great. Peeking in the fill hole, it's dark and gunky looking. I own various other vehicles that I've had since new with higher miles. None appear this nasty, one still looks new. Anyways, looking to change my oil own from now on to keep this thing on the road for as long as possible. I still love it. Known to have timing chain issues, so not sure a certain weight oil would even help with this? Mobil 1 suggests 5w-30 ESP. Not much info online, but VW people like to use rotella t6. Unsure how different the motors are, but a 15w-40 diesel oil seems too heavy?