Must I use that sold at the dealership? I always fear they over charge for us users that don't know better.
A nice guy at a local garage was going to top off mine with
http://www.gunk.ca/prodsht-en/M2716C%20M2732C.pdf
for free. Would that cause problems or will it be fine?

But I asked him to hold off.

Any cheaper facsimile you'd recommend? OR should I stick with what the dealership suggests (FYI they have mislead me in the past)

2000 VW Jetta VR6