:shrug:I've read a lot on the Star Tron additive, not only here but at the www.tdiclub.com forum for VW Diesels. It's a toss up on good, bad or ugly. I picked up a 8 oz bottle yesterday, and added one ounce when I filled up with 91 octane premium fuel. I have 3500 miles on my 2008 GW. I've...