I've been doing some research on a potential Amsoil oil selection for my wife's 2008 Jetta 2.0T FSI, and I was hoping for BITOG input. Some background: I have an Amsoil dealer membership. I'm not a huge Amsoil kool-aid drinker (and pretty big non-fan of their MLM system), but I do have one of their warehouses just a few miles from my home. Further, due to multiple vehicles to maintain and some motorsports-based hobbies, I have more internal combustion engines to keep up with than most. I view Amsoil as a one-stop-shop for above-average quality oil products, for all of my applications. Anyways, the Jetta is getting ready to roll over 60K, and hence lose it's powertrain warranty and the accompanying VW spec oil requirement. Up to this point I'd say roughly the 1st half of that 60K was with M1 0W40, and the second half has been with GC. Intervals have always been 5K, and will remain there in the future. Never have had an OA done. Usage conditions for the car would be a daily driver for my wife, as person who tends to drive efficiently, but not terribly aggressive. The daily commute is all surface streets, about 6 miles each way. The car sees maybe 20% highway speed type of use. It has the DSG transmission, which basically means that due to it's shift programming, unless you are flogging the car it's probably close to lugging the engine when driven around town. Environment where I live would typical Great Plains - hot in the summer, cold in the winter, plenty of humidity. My objectives in an oil choice would be in reference to this engine's shortcomings - protection of fuel pump cam follower, prevention (to the extent possible) of DI-induced carbon valve deposits, and resistance to sheer/grade degradation. My candidates for an Amsoil replacement are tentatively the AFL, DEO, and HDD offerings. This is strictly based on conversations I've seen in my many searches. From what I can glean from their Amsoil specs, via my fairly ignorant perspective, I'vd noted the following info: DEO - HT/HS: 4.1, TBN: 10.4, NOACK: 9.1 HDD - HT/HS: 3.6, TBN: 12.1, NOACK: 8.6 AFL - HT/HS: 3.8, TBN: 8.0, NOACK: 7.4 These metrics mean little to me, but I have seen them referenced in various threads, and thought I'd list them directly. My question is simply which Amsoil oil would you run if you decided you were going to run SOMETHING out of their product line? Is it one of the above? Am I splitting hairs with these selections? From my research at least it seems the AFL would be the easiest candidate to delete off of the list, but Amsoil also has 2 other offerings in their European oil line that I don't see mentioned much, nor have I researched. Finally, is GC a better oil than anything Amsoil offers, with respect to my application? As in, am I wasting my time and money transitioning from GC to something Amsoil? Or is that another splitting hairs question?