| Cause | Correction | |
| Low oil level |
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Check/replenish oil. |
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Check for a severe external oil leak that could reduce the pressure. |
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| Oil viscosity thin; diluted or wrong specification |
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Verify the correct oil is being used. Check for oil dilution. Refer to Troubleshooting Logic for contaminated lube oil. |
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| Malfunctioning pressure switch/gage |
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Verify the pressure switch is functioning correctly. |
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| Relief valve stuck open |
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Check/replace valve. |
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| Plugged oil filter |
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Change oil filter; review change interval. |
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| If cooler was replaced, shipping plugs left in cooler |
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Check/remove shipping plugs. |
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| If replaced, four cylinder lube pump installed ina six cylinder engine. |
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Verify that the correct pump is installed. |
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| Loose or missing cup plugs |
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Check/replace cup plugs. |
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| Suction tube loose or seal leaking |
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Check/replace seal. |
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| Worn lube pump |
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Check/replace lube pump. |
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| Loose main bearing cap |
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Check/install new bearings and tighten cap. |
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| Worn Bearings |
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Inspect/replace bearings; also check/replace piston cooling nozzles. |