Actually no, it's because originally when they came out with the 2.x V6 engines they kept having timing chain issues with sludge build up in the "front' of the engine.  At the time all they specified was 5w30 and I'm not sure if the oil change interval was 3k or higher.  After they tracked down the source of the timing chain issues they revised their recommendations to 5w30 every 3k with synthetic oil.  Last I knew they had no brand recommendations, just synthetic oil.

ah, I guess I just assumed they spec'd Mobil 1, my bad. They do in alot of their cars.