All used car prices are higher than a year or two ago. ALH and BEW TDIs are running over $3000, with wagons over $5000. I doubt that asking prices of $7000 or higher are being met unless the particular vehicles are really spectacular.
After seeing this thread I decided to check their inventory at East Bethel. They've just received two 2001 Golfs, Oct 20th and Oct 21st. No information on which engine or transmission, but they might have parts that will fit on a 2002 Jetta wagon. Let us know if you check them out and what you find.
ZDDP is not a miracle oil additive. It's just zinc, and newer oil blends do not have as much of it as they did 5 or 10 years ago. I do not have a PD engine but if I did I would be adding an ounce or two of ZDDP at each oil change.
I haven't heard anything recently from or about the names on the list, but they were all well-regarded in the past.
The guy running this shop is a TDI Club member and a registered vendor. He seems okay but of course I don't know him personally...
Are you double-counting purchase price and depreciation? Purchase price is not a cost of ownership, but depreciation is.
Your maintenance costs seem too low. When I do my own TCO calculations, they average about 22 cents/mile.
I was surprised to discover that there are 1600 Sinclair stations -- I never thought there were that many. The company's HQ is in Salt Lake City. There are only a handful of Sinclair stations east of the Mississippi.