II have a 2018 M3 LR that went into the SC and for corroded brake lines and has now has been found to have a defective battery due to corrosion issues. Tesla is refusing to honor the warranty because they say there is dirt in the undercarriage. I explained that the underside of the car has been cleaned repeatedly and dirt is an unavoidable fact of life on roads that get sanded. They claim this is "misuse" and my less than 5 year old tesla is now totaled. I am still hoping to get a better resolution, but for now I would warn against owning a tesla if you ever drive on a dirt road, ski area parking lot, etc.