Water in Oil and New Car Warranty — What You're Entitled to in NZ

Manufacturer Warranty and Oil Contamination

If your vehicle is within its manufacturer warranty period and develops water or coolant contamination in the oil, you likely have a claim under the warranty — provided the contamination is caused by a mechanical defect rather than driver error (such as driving through deep water). Head gasket failures, oil cooler failures, and intake manifold gasket failures within the warranty period are warranty items.

Consumer Guarantees Act (CGA)

New Zealand's Consumer Guarantees Act provides protection beyond the manufacturer warranty period. If a vehicle develops a fault that a consumer would reasonably expect not to occur at that age and mileage — such as head gasket failure at 80,000 km on a vehicle sold as reliable for 200,000 km — the CGA gives you rights against the seller regardless of the expressed warranty period.

What Documentation You Need

For a successful warranty or CGA claim arising from oil contamination: maintain all service records showing the vehicle was properly maintained; get EEK Mechanical's Oil Contamination Report documenting the contamination type and source; and if the dealer disputes your claim, refer to the Motor Vehicle Disputes Tribunal (MVDT). EEK Mechanical's certified report is accepted as evidence by the MVDT.

Dealer Tactics to Watch For

Some dealers may claim contamination was caused by driver error or improper maintenance. Having an independent technical report from EEK Mechanical — obtained before the dealer inspects the vehicle — establishes the contamination state objectively. Call us first.