I am somewhat new to TDI world, but got the 2004 jetta BEW, with tiptronic crap. Next project is ATF change, called dealer and they are asking $29 per 1L . has anyone done this with different ATF? Also thinking about venting crankcase into the air and pluging the intake hole for that? Will that trip any ECU lights? Or have any other effect on the reliability? Need all the advice I can get, Thatnk You.