Detailed Notes: 88C: On M 42 motors, thermostat housing gasket 11 53 1 721 172 and thermostat & O& ring 11 53 1 721 218 should be replaced. On M 50 motors, thermostat & ring 11 53 1 265 084 and thermostat gasket 11 53 1 748 047 should be replaced up to production 5/92.
