I have had great experiences with Ineos Arrowhead in Phoenix. Justin has been great to work with. He got my Grenadier in for a few small warrantee electrical issues. I had a 5,000 mile oil change done in California. Justin recommended the differential oil changes at 7500 miles. They needed to keep my Grenny for a few days to complete the software update and the service. Justin loaned me a Quartermaster for the week to drive. It was really helpful and fun to cruise around in style in the QM. I hit traffic on the way up to Phoenix and Justin waited for me to arrive to pick up my car.
There is some difference in opinion over the service intervals, but I follow the dealership recommended intervals. I am going with 5,000 mile oil changes. I've heard that is what BMW recommends for the B58 engine. It differs from Ineos recommendations at 12,000. But oil is the lifeblood of the engine, so why not get it done more frequently?
Ramiro is the director of the dealership and always gives me a big greeting and shout out for all the customization that I have done. I agree they are IG enthusiasts and not just salespeople. Ramiro gave me a spare tire cover, so I now I rep Ineos Arrowhead. It's more discrete than the one I got in San Rafael! Everyone asks me, "what kind of car is that" anyway. So, now I can point to the tire cover!