Hey spannman, I think we've conversed on freds a bit. I'll chime in as I have a TDI and E300 as well.

In as few words as possible, GET THE CAR, it kills. I ran amsoil series 3k when I lived up north, but since getting my tdi and moving to florida, I run delvac 1 in both. Its so easy to just order it online and have it delivered, for those who have trouble finding it or drive all over to get it. Avlube sells it for $81 per case.

Rick, I think your recently developed engine problem could be a bad MAF sensor, is your check engine light on? Mine went bad at 35k. Check your fuel filter line for bubbles, possibly clogged filter, and check for dirty air filter. Thats funny about your injectors. The dealer replaced mine, and two of the new replacements were bad as well. Luckily they did this all in 2 days, while I rolled in the ML 430 AMG loaner car they gave me.(which sucked actually)

Good luck spannman!

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2004 Ram 2500 Cummins HO
2000 Jetta TDI
1999 E300 (sold)