Vehicle Oil Contamination After Flooding — Hawke's Bay Recovery Experience

Scale of the Events

Cyclone Gabrielle in February 2023 caused the most extensive vehicle flood damage New Zealand had seen in decades. In Hawke's Bay alone, thousands of vehicles were affected across Napier, Hastings, the Esk Valley, and outlying communities. The flooding in 2025 — while less severe in geographic extent — concentrated damage in the Clive and Whirinaki areas.

What We Found at the Scene

In the immediate aftermath of Cyclone Gabrielle, the most common scenario we attended was vehicles that had been partially submerged — floor level to bonnet level — and had owners attempting to assess or start them after the floodwaters receded. The proportion of vehicles with water in the oil system was high — over 80% of vehicles submerged above wheel height showed oil contamination or risk of contamination after the workshop assessment.

The Attempted Starts

The saddest cases were vehicles where the owner had attempted to start the engine after the flood — sometimes successfully at first, before hydrolocking, and sometimes with an immediate hydrolock on the first revolution. In both scenarios, the repair cost went from a few hundred dollars to several thousand.

The Right Protocol After a Flood

After any vehicle submersion: do not touch the ignition. Call EEK Mechanical and your insurer simultaneously. We dispatch a tow truck immediately, document the situation at the scene, and take the vehicle to a certified workshop where the oil system is drained, flushed, and refilled to manufacturer spec. In the Hawke's Bay events, we co-ordinated directly with IAG (AMI, State), Tower, and FMG assessors to streamline the claims process for affected policyholders.