Diesel enthusiasts. I change the trans fluid in my 2005 cdi once a year along with the filter. At some point I asked George Murphy about the torque converter drain plug and I think his response was that that model year did not have a drain plug. In an article in a previous forum concerning the 722.6 transmission, a plug was mentioned. Does this model have a plug and what size is the crankshaft bolt to turn the engine? Thanks, Steve. By the way, on a recent trip, I got 41.0 for one day, I generally get about 38-39 on the road.