W18.30-1015-06
Location
1 Oil/coolant module
2 Oil thermostat
3 O-ring
4 Cover
The oil thermostat (2) is built into the oil/coolant module (1), which is located on the left side of the engine.
Task
The oil thermostat (2) is used to regulate the engine oil temperature.
W18.30-1016-74
Design
2.1 Housing
2.2 Sliding ring valve
2.3 Spring
2.4 Operating piston
2.5 Expansion element
3 O-ring
A Oil thermostat open
B Oil thermostat closed
W18.30-1017-74
Function
2 Oil thermostat
5 Oil/water heat exchanger
A Oil thermostat open
B Oil thermostat closed
At an engine temperature of less than 115 °C the engine oil is routed through the open oil thermostat (2) over a bypass straight into the oil filter. At 115 °C the oil thermostat (2) closes the bypass and the engine oil flows first to the oil-water heat exchanger (5) before reaching the oil filter.