Thermostat, 88C - E30, E36, E28, E34, E39, E24, E32, Z3, M20, M50, S52

Your engine's thermostat regulates coolant flow and temperature in the cooling system. When open it allows coolant to flow into the radiator to be cooled. When closed the coolant circulates through the engine, where it stays warm. A failed thermostat will either be open or closed with the engine running too cold (poor fuel economy and performance) or too hot (overheating). It can also impact your cabin heating/cooling since that is drawn from your heater core.

BMW used the same design of thermostat for many models from the 1980s-1990s but with different temperature ratings. This is the 88C degree thermostat (near the hottest end of the temp scale). 88C was standard on E30 318i M42, E36 323i/325i/328i/M3, E34 525i M50, and MZ3 S52. Thermostats are interchangeable among the models listed below but note that using a non-standard thermostat will alter your engine's performance.

Includes the thermostat o-ring (11531265084) but not the housing profile gasket (see Related Items below).

This part is manufactured by an aftermarket supplier of European auto parts, including many cooling components. While not carrying OEM status, this part follows the design of the original very closely and uses similar materials. An aftermarket part may even have the same TUV approval as its OEM counterpart. The brand may even be OEM to another manufacturer besides BMW. This aftermarket brand has a two year warranty - the same as Genuine BMW and OEM brands.

BMW Fitments:

3 Series
E30 (84-91) > 318i
E30 (84-91) > 318is
E30 (84-91) > 325e
E30 (84-91) > 325es
E30 (84-91) > 325i
E30 (84-91) > 325is
E30 (84-91) > 325ix
3 Series
E36 (92-99) > 318i M42
E36 (92-99) > 318ic M42
E36 (92-99) > 318is M42
E36 (92-99) > 323ic
E36 (92-99) > 323is
E36 (92-99) > 325i
E36 (92-99) > 325ic
E36 (92-99) > 325is
E36 (92-99) > 328i
E36 (92-99) > 328ic
E36 (92-99) > 328is
E36 (92-99) > M3 (1995)
E36 (92-99) > M3 (96-99)
5 Series
E28 (82-88) > 528e
E28 (82-88) > 535i
5 Series
E34 (89-95) > 525i M20
E34 (89-95) > 525i M50
5 Series
E39 (97-03) > 528i 97-98
E24 (77-89) > 635CSi
7 Series
E32 (88-94) > 735i
E32 (88-94) > 735iL
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.8 97-98
E36/7 / E36/8 Z3 (96-02) > Z3 M - S52