Originally Posted By: saaber1
Which apparently you have not bothered to look at. The 40+ UOAs for the 2.0 FSI show that all oils are shot by around 5k miles in that DI engine.
I'm assuming you're referring to the chart you posted earlier:
http://i140.photobucket.com/albums/r34/saaber1/uoa10b2.jpg
Either I'm blind, or I don't see even a single UOA that is showing that the oil is *anywhere* near condemnation limits in any of those engines, or even half-near.
TBN's are all in the 5-6 range, (really don't want to get much under 2). Insolubles are low. Fuel contamination is pretty much non-existent. No viscosity issues. Per unit iron is tapering off as a natural break-in process takes place. There isn't a UOA there that tells me that at least a 12-15k interval is out of the question with any of the oils used. Swap the filter out at 12-15k, and replace a quart, run to 20k, and the do an oil change at 20k would be my initial recommendation based on that spreadsheet of data. GC's not really an extended drain oil (and is really over-hyped), but if a true extended drain product were used (ie: Esso XD-3 0W-40, Amsoil 0W-30/40, etc., with dual gas diesel ratings and TBN to match), 25k with just a filter swap isn't really a stretch at all.
I know people freak out when I'm suggesting they should change their oil 10% as often as their grandpa did on his cars, on a car that costs 20X as much, but my recommendations are based on science, not junk advertising or folklore from the quickie-lube industry.