SPN 100 — Engine oil pressure — out of range

Likely causes

• Low oil level or oil too thin for the temperature
• Faulty oil pressure sensor or plugged oil filter
• Worn oil pump or excessive engine bearing clearance

Recommended checks

1. 1

   Check oil level and viscosity (SAE 15W-40 for heavy-duty diesel)

2. 2

   Replace the oil filter and measure real pressure with a mechanical gauge

3. 3

   Inspect the oil pump and overall engine condition if low pressure persists

Parts to replace

• Diesel engine oil 15W-40

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• Heavy-duty truck oil filter

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• Oil pressure sensor

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