phlegm2 wrote: ↑I don't have experience with GM, but much of what you describe sounds fishy in general. Do you know why the vehicle would have to be 6 months old/12,000 km before warranty would be honoured? While that could be GM's policy, I've never hear of anything like that before. That said, you yourself say you meet this odd criteria, so I'd press matters with GM Canada head office. Have them contact the dealership on your behalf.
Re Canadian dealers, they shouldn't be saying anything about your US vehicle. What if you originally lived in the US, but were transferred to Canada, bringing your vehicle? Would the dealer be angry about that? IMO, it's none of the dealer's business where you bought the car - if it qualifies for warranty work, then it qualifies...period.
As for the odometer/speedo, remember that the RIV determines what modifications are necessary for import - not the manufacturer. So, anything beyond that is strictly an impossed barrier by the manufacturer to curb imports. You'll definitely want to confirm this one with head office again - hope they aren't enforcing that one.
Thanks Phlegm for the reply. I'll bring in my vehicle to the local dealer tomorrow.