I put the new Mobil 1 10w-30 in my 2005 Accord. Runs great with it. It's good to see a large oil company like ExxonMobil push for extended drains, much like Amsoil has for years. In Europe, the average person changes their oil every 10,000 miles. Only here in the U.S. where quick lube places have an impact along with stringent EPA regulations, do we still change the oil at 3-5k mile intervals. With the 2.4L, you can technically go 10,000 on the regular stuff, but I'd feel more comfortable with a high end PAO/Ester synthetic like M1/Amsoil than a regular dino oil. Cleaner engine and less deposits. Well worth it. Any questions about oil, go to www.bobistheoilguy.com

Mobil 1 has always been tested for 25,000 mile drains and in fact recommended that when it first came out. However, the automakers weren't too happy with that so they dropped it.

 

Seems like you'd have to support that with oil analysis. I don't see a lot of people on BITOG saying to go long intervals without UOA.

Degradation of the oil itself isn't the only thing to worry about. There's dilution with fuel, contimination with combustion products, all sorts of other things can happen beyond the control of the actual oil.

 

If you search around, you'll see tons of oil analysis for Mobile 1. I'm not sure about the new 15k stuff, but "regular' Mobile 1 synthetic has been around forever. I've known of people using it way back in the day. They recommend 12 months or 12,000 miles I believe it is for Mobile 1, whichever comes first. I personally have been using Mobile 1 for a while now, but I change it every 6 months or 6,000 miles, whichever comes first. In the end, I change the oil half as much as regular 3,000 mile oil and the cost comes out to be roughly the same.