quote of the moment

"the most common turbocharger failure is bearing failure related to
repeated hot shutdowns with in adequate 'cool down' periods. a sudden
engine shut down after prolonged operation will result in the transfer
of heat from the turbine section of the turbocharger to the bearing
housing. this causes the oil to overheat and break down, which causes
bearing and shaft damage the next time the vehicle is started."

-- 2008 PT cruiser service manual, volume 3, page 11-23