I'm puzzled by the fact that my 2007 Sprinter transmission has no dip-stick so that you can inspect the fluid level. What are other owners doing in this regard. Is there an aftermarket widget? Not having any problems with the van, but trying to think in advance. Any idea how many miles I should/might get before thinking of a new/replacement tranny? Mine has 130K on it. What about just changing the fluid - is there a filter in there as well? Guess I really need to get ahold of a manitenance manual. Thanx for any/all responses.