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SPN 175 FMI 16

Engine Oil Temperature 1 — Value too high (moderately severe).
The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

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

What FMI 16 usually points to: A developing over-condition that often precedes a derate. More on FMI 16.

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 16 mean?

Engine Oil Temperature 1 — value too high (moderately severe). The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

Is SPN 175 FMI 16 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 16?

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