Why a Standard Oil Change Won't Fix Water Contamination
A regular oil change is not sufficient when water has contaminated engine oil. You need a complete flush — here's why, and what the difference is.
Why Draining Isn't Enough
A standard oil change removes oil from the sump — typically 5-8 litres depending on the engine. But a contaminated engine also has oil in the oil galleries, the oil cooler passages, around the crankshaft bearings, and in the valve train. A simple drain leaves contaminated residue throughout the system, which then mixes with the fresh oil you add. Within a short time, you have contaminated oil again.
What a Proper Flush Does
A proper oil system flush involves draining the contaminated oil, adding a flushing agent designed to clean oil galleries and bearing surfaces, running the engine briefly at idle (only if the source of contamination has been resolved), draining the flush oil, replacing the filter, and then filling with fresh oil. This process removes the contaminated residue from all parts of the circuit.
The Source Must Be Fixed First
Flushing and refilling is only the first step. If the head gasket is still failed, or the oil cooler is still leaking, new oil will be contaminated within hours or days. EEK Mechanical identifies and documents the source of contamination as part of our service — this is what allows you to get a proper mechanical repair done before refilling.
EEK Mechanical's Process
Our oil contamination service is a complete system flush — not just a drain. Your vehicle is collected by tow truck and taken to a certified workshop where the full oil system drain, flush, and refill is carried out to manufacturer specification. Call 0800 769 000.
Related Articles
Coolant Mixing with Engine Oil: What You Need to Know
Coolant mixing with engine oil can cause severe engine damage. Learn how it happens and what to do next.
Post-Flood Car Checks: Oil Systems & Professional Inspections
Learn how to check your used car's oil system after flood damage and why professional inspections are crucial. Get expert advice on avoiding hidden risks.
What Causes Water in Engine Oil? A New Zealand Guide
Water in engine oil is one of the most destructive mechanical events a vehicle can experience. This guide covers the five most common causes and what to do in New Zealand.