[Sylvan Lake V35]

I had a custom tune on our X5d and had a DPF issue and hey fixed it, on the test drive they found out it was tuned. The SA said the tech took it for a test drive came back and said it was bonkers. Anyway they warrantied it but said they "shouldn't" they said the tune caused the DPF issues...I didn't ask questions or argue I grabbed my keys and left. I think if you specified "no test drives" they would never know. I guess it's rolling the dice.....Canada is also different than the US I think the US hey have to prove your modification caused the failure if they deny you warranty.