The Audi dealer did the oil changes on our Q7 before we purchased it at their 10,000 mile intervals, on time every time, even confirmed via an excellent CarFax reporting. We purchased it at 84,000 miles. They had just done another oil change service on it before we purchased it. we drove it 400 miles and it gobbled a quart of oil.
I asked the dealer what they used for their oil in their service department and they told me they use the Audi recommended Castrol Euro in a 5w40 flavor. Thats why I said I could care less about Euro specs, because this is the oil that stuck the oil control rings in the first place and coked them up in the pistons. So myself, I have no desire to use Castrol. I've used Mobil1 0-40 Euro in the past with great success in the Audis, but the CREC engine is know for its low tension oil control rings, but the fact remains it's the Castrol Euro that couldn't keep the rings and pistons clean enough. So really what good is the Euro spec right.
Exactly why I'm using the VR&P now, cause I don't care about using the Euro spec oil that did the carbon deposit damage to the Q7 in the first place.
