Water in Oil FAQ

Milky, creamy, or brown-tinged oil on the dipstick or filler cap means water or coolant has mixed with your engine oil. The most common causes are head gasket failure, oil cooler failure, or flood/water ingress. There is no benign explanation — it always indicates contamination.

Do not start the engine. Running an engine on contaminated oil destroys bearings within minutes. Call us and we will dispatch a tow truck to collect the vehicle and take it to a certified workshop for full oil drain and flush.

No. Water or coolant in engine oil destroys the protective lubricating film between metal surfaces. Bearings, journals, and cylinder walls suffer cumulative damage with every revolution. Driving even a short distance can turn a recoverable contamination into a full engine rebuild.

Park, do not start, and call us. We will arrange a tow.

Not necessarily — but it depends on how long. If you started the engine briefly and immediately turned it off when something seemed wrong, the engine is usually still recoverable. If you drove it for any meaningful distance, the damage is more severe and may require additional component replacement.

Either way, do not start it again. The workshop assessment will show how far the contamination has spread and what work is needed.

1. Do not start the engine. Hydrolock from water in the cylinders bends conrods and destroys the engine.

2. Call us — we will dispatch a tow truck.

3. Call your insurer — flood damage is covered by most comprehensive policies. We coordinate documentation directly with major NZ insurers (IAG, Tower, FMG, AA Insurance).

4. Do not let anyone "just try it to see if it starts". One failed attempt can write the engine off.

No — water-in-oil recovery is always done at a certified workshop. We dispatch a tow truck to collect the vehicle from wherever it is (driveway, roadside, flooded area), then take it to our nearest certified workshop where the oil system is fully drained, flushed, and refilled to manufacturer specification.

This is the only way to do the job properly. Mobile oil-only changes do not address the contamination in the oil cooler, oil pump, or galleries — only a full workshop service does.

Our average dispatch time is 30 to 90 minutes nationwide. We have hundreds of certified workshops and tow operators across New Zealand. The closest available is dispatched immediately when you book.

You will see a live ETA in your customer portal as soon as the tow operator is assigned.

For a straightforward oil drain, flush, and refill: typically same day or 1–2 days, including the tow.

If the underlying cause is a head gasket or oil cooler that needs replacement, it can be 3–7 days for parts and labour. The workshop will give you a clear estimate after the initial assessment.

Costs depend on vehicle type, oil capacity, and the underlying cause of the contamination. A standard oil drain, system flush, new oil filter, and refill with manufacturer-spec oil typically falls in the range covered by your deposit plus workshop time.

Many comprehensive insurance policies cover this work as flood damage, head gasket failure, or sudden mechanical breakdown. We provide a full insurance report you can submit to your insurer.

Call us for an instant, no-obligation quote.

Stop driving immediately, then call the rental company first to log the issue and follow their procedure. They will normally arrange recovery directly. If they ask you to organise it, call us — we will coordinate with the rental company on documentation and invoicing.

Do not start the vehicle "to test" it. The rental company will not appreciate paying for a destroyed engine.

Many comprehensive policies cover water-in-oil events caused by:

• Flood or storm damage — covered as natural disaster / weather damage
• Head gasket failure or oil cooler failure — covered as sudden and accidental mechanical breakdown in many comprehensive policies
• Hydrolocking from driving through floodwater — covered under accidental damage in most policies

Important: if the engine has been started or driven after contamination, the insurer may decline or reduce the claim. Document this honestly. We provide a full technical report that insurers in New Zealand routinely accept.