While operating vehicle at 45 MPH, engine crankshaft seized and vehicle broke down in the middle of the roadway. This diesel engine was serviced routinely and oil changed with specified land rover oil per manufacturer specs. There is a class action lawsuit in UK over this motor for defective crankshaft issues.This is a 2016 RR TDV6 Gen 2 diesel motor with about 145K miles. There is a Range Rover service bulletin regarding defective crankshaft issues. The manufacturer declines to handle this as a defective manufacturer issue and will only offer a new motor at our cost.