Water in Oil Emergency — The One Thing You Must Not Do
If you suspect water in your engine oil, the single most important action is not starting the engine. Here's why, and what to do instead.
The Single Most Important Rule
If you see milky oil on your dipstick, notice your coolant level has dropped, see white smoke from your exhaust, or have any reason to suspect water or coolant has entered your engine oil — do not start the engine. Do not turn the key. Do not move the vehicle under its own power. Call EEK Mechanical on (866) 777-3712.
Why Starting Makes It So Much Worse
When an engine runs with water or coolant in the oil, several things happen simultaneously: the oil pump circulates the contaminated emulsion through all bearing surfaces; the bearings — which rely on a pressurised oil film — lose that film protection and begin metal-to-metal contact; heat generated by friction causes further degradation; and if water has reached a cylinder, hydrolocking causes instant catastrophic mechanical failure. Five minutes of running on contaminated oil can produce damage that takes significant cost to repair. Five seconds with water in a cylinder produces damage that cannot be repaired — only replaced.
What to Do Instead
Keep the engine off. Note what you have observed. Take photos of the dipstick and oil filler cap if safe to do so. Call (866) 777-3712. wait for the tow truck. Do not allow breakdown services to start or move the vehicle unless they have been briefed on the situation and confirmed the engine is safe to run (it typically is not).
Related Articles
Buying a Used Car After Flood Damage: Oil Checks and Red Flags
Learn how to spot flood damage in a used car, check for water in the oil, and when a professional inspection is essential before you buy.
Understanding US Insurance Coverage for Water-in-Oil Claims
Learn what US insurers typically cover and required evidence for water-in-oil claims. Contact EEK Mechanical for assistance.
Parked in floodwater? What to check before you try to start the engine
Water in the oil after flooding can damage your engine. Learn the safe steps to take before starting a flood-affected vehicle in New Zealand.