I purchased a 2011 terrain SLT1 in April. My question is that I have paperwork handwritten by my sales guy where he put that I have a 4yr/50000 mile warranty bumper to bumper. I thought it was 3 yr./36000 standard. What should I do since it seems they made a mistake. I will fight it to the end to get the extra yr/mileage. Should I contact GM or the dealer? Or wait till I cross that bridge,and show them my evidence were I signed the paperwork refecting the 4yrs.