Selling a Car with Water in Oil — Your Legal Obligations in NZ
If you're selling a vehicle with known or suspected water in oil, you have disclosure obligations under New Zealand consumer law.
Do You Have to Disclose It?
Under New Zealand's Consumer Guarantees Act and the Fair Trading Act, private and trade sellers have different obligations. Trade sellers (dealers, car yards) must not make false or misleading representations about a vehicle's condition and have implied warranties under the Consumer Guarantees Act. Private sellers are not held to the same standard but still cannot make misrepresentations — if asked directly, you cannot lie.
Trade Sellers — Clear Obligation
If you are a dealer selling a vehicle with known oil contamination, you must disclose it. Selling a vehicle with a known head gasket failure as a sound vehicle is a breach of the Fair Trading Act and the Consumer Guarantees Act. Penalties include cancellation of the sale, compensation for consequential damage, and Fair Trading Act fines.
Private Sellers — Practical and Ethical
As a private seller, you are protected by "buyer beware" (caveat emptor) to some extent — unless you make specific representations about the vehicle's condition. If you say "sound, no oil issues" and the vehicle has known contamination, you are making a misrepresentation. The safest and most ethical approach is to disclose, have the vehicle serviced before sale (EEK Mechanical can provide the manufacturer-spec fuel system recovery), and adjust the price accordingly.
EEK Documentation for Sale
EEK Mechanical provides a written Oil Contamination Service Record that documents the vehicle was recovered to manufacturer specification, the contamination source was identified, and the recommended mechanical repair. This document protects both seller and buyer and can be provided to the buyer as part of the sale.
Related Articles
Vehicle Parked in Floodwater? Steps Before Starting With Water in Oil
If your vehicle has been sitting in floodwater, water may have entered the oil. Learn the safe steps before starting, and how EEK Mechanical recovers it.
Coolant in Engine Oil: Warning Signs and Why You Shouldn't Keep Driving
Coolant leaking into engine oil can destroy an engine fast. Learn the warning signs, why driving worsens it, and how tow-to-workshop recovery works.
Milky Oil on the Dipstick: Causes, Urgency and the Tow-to-Workshop Process
Milky oil on the dipstick signals water in your engine oil. Learn the causes, why it's urgent, and how EEK's tow-to-workshop recovery works in NZ.