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SPN 175 FMI 15

Engine Oil Temperature 1 — Value too high (least severe).
The reading is above normal, but only at the lowest warning level.

What the SPN covers: Temperature of the engine oil. More on SPN 175.

What FMI 15 usually points to: An early warning: mild over-temperature or over-pressure, or a sensor starting to drift high. More on FMI 15.

Severity

HIGH — limit use, diagnose now

High oil temperature thins oil and can damage bearings. Reduce load and get it checked.

Likely causes

  1. Engine overloaded or overheating
  2. Plugged oil cooler
  3. Low oil level
  4. Sensor or wiring fault

Checks & fixes (easiest first)

  1. Check oil level and coolant temperature
  2. Inspect the oil cooler
  3. Compare sensor reading to coolant temp after warmup

FAQ

What does SPN 175 FMI 15 mean?

Engine Oil Temperature 1 — value too high (least severe). The reading is above normal, but only at the lowest warning level.

Is SPN 175 FMI 15 serious?

High oil temperature thins oil and can damage bearings. Reduce load and get it checked.

What should I check first for SPN 175 FMI 15?

Check oil level and coolant temperature; Inspect the oil cooler; Compare sensor reading to coolant temp after warmup.