For good measure, throw in a bottle of Chevron Techron, Redline SI-1, Gumout Regane, etc for additional cleaning power (from polyether amine)
Additive I have been using was Stanadyne perf, but after seeing the results of tests, I have just purchased a gal of Opti XPD to replace my Stanadyne
Power service white bottle about 4oz every fill up. Have 2k on the car no problems yet, will switch to grey bottle in a bit.
BG is generally good stuff, as is LUBRO/LIQUI MOLY. BG is pushed pretty hard to service stations etc, and people like it since it is flashy and german. it also has a pretty established history because of their BG44K product.
44K is great stuff. Sure, it seems rather expensive, but it works very well and I've used it on many cars for me and my family and friends.
If you're not using a fuel additive like Power Service or Stanadyne then go get some now. There is no way you can survive the winter without it, regardless of what VW says...or doesn't say on this point. Your fuel is gelling on you, there's no question about it.
My dad and I use PowerService DieselKleen. It adds up to 6 cetane points depending on concentration. It's also ideal for filling up your fuel filter when you change it. It's in the grey bottle. They also sell an additive in a white bottle called Diesel Fuel Supplement which is an anti-gel additive and cetane booster, but it only boosts up to 3 points. They also have Diesel 9-1-1 which is an emergency additive to de-gel fuel. A good thing to carry during the winter.
I haven't used the oil treatment yet, but I was amazed at how well the fuel additive worked. I noticed an immediate increase in fuel efficiency (in two different cars).
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