I was in Walmart yesterday and I noticed they have Super Tech DEXV1. I normally use mobil 1 atf, which covers every spec known to man, I think. But I was informed that all DexVI is synthetic and DEXVI is DEXVI regardless of the brand, according to this BMW tech that I spoke to. So am I to assume that I can use this in my 10 yr old BMW X5? Not that I would but $4.29/qt is better than $9.00/qt for the M1. I do a drain and fill times 3 every 50,000 miles so I get about 90% of the old ATF out of the trans. I think that is better than waiting a lifetime to have a flush and fill.