Oil Temperature Sensor

Some cars show it on the dash. It helps protect the engine. It may be combined with level sensing. Some engines use oil temperature to adjust warm-up, variable valve timing and service interval calculations. Replace the seal when fitting a new sensor. A sensor that reads too low can delay warm-up strategies, and one that reads too high can trigger unnecessary warnings or reduce power. Comparing the reading with coolant temperature after a drive is a simple plausibility check.

A thermistor changes resistance.

Leaking seals cause oil loss. Wrong readings affect warnings.