Can't help on the auto-box oil but I can tell you the difference between CDT and CDTi
There is none.
Well, nothing physically different between the two engines anyhow. The only difference is the ECU engine map. The CDTi map gives more horse power output than the standard map. It is possible to get an upgraded map from an ex-Rover/MG garage but expect to pay high costs for the privellage. I believe you can get a similar result using aftermarked remaps.
As an alternative to the ECU map, have you got/going to get a RonBox (Rover Ron's tuning box and MAF sensor upgrade for CDT/i engines - allows you to fine tune your engine between economy and performance)
Removing front bumper is a fun thing to do. (note: read fun as 'tricky and long'
) Check out this thread for details on this
http://www.the75andztclub.co.uk/foru...read.php?t=204