When I owned my Rabbit, it was overheating bad. I used Duralube oil treatment, and it helped a lot, and it ran a little better too. I haven't bothered using it again, cuz I don't know if it's compatable with Mobil 1, or any synthetic for that matter. Everyone I've asked has told me they don't know, and it doesn't say anything on the bottle. As far as it goes for using Fuel System treatments, I went for the Chevron Techron, but they were sold out, and I bought the Duralube stuff. It didn't do anything noticeable. If you're looking for stuff to use for the injectors, definately go with the Chevron Techron..from what I hear, it's the best.
[Edited by asso on 03-22-2001 at 03:39 PM]