BMW Genuine Waterpump Thermostat with O-Ring 80 deg. C E46 E85 E86 Z3 M3 Z4 M3.2 Z4 M3.2 Z3 M3.2 BMW Genuine Waterpump Thermostat with O-Ring 80 deg. C E46 E85 E86 Z3 Waterpump - Thermostat -- Manufacturer Warranty: 24000 miles or 2 years Please see Product Description below for vehicle compatibility