Volvo Penta
Oil Contamination
Engine oil level rises or oil appears milky; possible fuel or coolant contamination.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Leaking injector causing fuel dilution, Failed fuel pump seal leaking into crankcase, Internal coolant leak, Condensation from short run cycles
How to Fix / Troubleshooting
Safety: Do not run the engine with contaminated oil; lubrication is compromised.
- Identify contaminant: Smell the oil for diesel odor (fuel dilution) and inspect for milky appearance (coolant).
- Change oil and filter: Drain oil and replace filter with Volvo Penta parts. Refill with correct oil grade.
- Investigate source: For fuel dilution, test injectors and high-pressure pump for leakage. For coolant, follow internal leak diagnostics.
- Adjust run profile: Avoid very short test runs that never bring the engine to full temperature, which can cause condensation buildup.
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Repair Difficulty
Hard
4/5
Required Part
Engine Oil Filter
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