Just enjoying the fourth session of a lapping day when the engine lost all most all power, very loud knocking. Speculation at the track is that something metalic came loose in the oil system. Flatbedded back to the Vancouver dealer who will open it up in the next day or two, hopefully. It's a 2021 with 11,000 kms, properly track prepped, including to litres of extra trans fluid. Expecting warranty but the dealer said GM may want to rebuild. No way I'd accept that without a battle. Any thoughts?