Spoke to a "friendly" agent at the CSBA earlier this morning and she can't understand why I was charged the 6,1 duty for a 40 year old car
Just mailed my CBSA informal adjustment request with my Vehicule import form (Form 1) and the B-15 form (Blue).
Processing time should be somewhere between 4/8 weeks.
Thanks to GWN7 and Duncan for all the info.