Engineering · Diesel — Lubrication
A milky, emulsified appearance of the crankcase lube oil indicates:
- AFuel dilution
- BWater contamination✓ Correct
- CExcessive additive depletion
- DNormal high-temperature operation
Explanation
Milky oil is water emulsified into the oil — typically from a cracked liner, leaking cooler, or head-gasket failure. It destroys the oil film and must be investigated immediately.
Authority: Diesel Engines (USCG engineering topic)
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