Mechanical Breakdown Insurance

Mechanical Breakdown Insurance (MBI)

Buying a used car often feels manageable until the first unexpected repair bill arrives. Loan repayments are predictable, fuel costs are easy to estimate - but a failed gearbox or electrical fault can arrive with no warning and no room in the budget.

That's where mechanical breakdown insurance, usually shortened to MBI, is worth understanding. It isn't the same as standard car insurance, and it isn't automatically included with finance. It's a separate form of cover designed for mechanical and electrical failures that occur after the manufacturer's warranty has ended

‍What is mechanical breakdown insurance?

Mechanical breakdown insurance is a policy that helps pay for certain unexpected mechanical or electrical faults. Standard car insurance protects against accidents, theft, and fire. MBI covers the vehicle's internal components when something fails (eg. engine, transmission, electrical systems) without an accident being involved.

That distinction matters because many people assume comprehensive car insurance covers everything. It doesn't. If a transmission fails or an electrical system develops a fault, a standard car policy typically won't respond.

MBI tends to come up most often with used vehicles because that's where manufacturer warranties have usually ended. New Zealand's vehicle fleet has an average age of 13.8 years - for many owners, a major repair bill arrives with no warranty protection remaining.

What MBI can cover

A typical MBI policy is built around sudden mechanical or electrical failure in named components. Cover commonly includes:

• Major mechanical components - engine, transmission, driveline and other specified systems
• Electrical systems - sensors, control modules, and wiring, which are increasingly relevant in newer used cars, hybrids, and EVs
• Breakdown assistance - towing and roadside help if the vehicle cannot be driven safely
• Trip-related support - accommodation, travel, or vehicle recovery costs after a covered breakdown away from home

Policies in NZ can apply to petrol, diesel, hybrid, and electric vehicles, typically up to 20 years old with under 200,000km on the odometer. Cover periods are generally available from one to four years.

Common exclusions

MBI is not a substitute for maintenance and it doesn't cover every repair. Common exclusions include:

• Wear and tear - parts that gradually wear out through normal use
• Pre-existing faults - problems that started before the policy began
• Accident damage - collision-related repairs sit under standard car insurance
• Poor maintenance - damage linked to missed servicing can lead to a declined claim
• Routine ownership costs - servicing, adjustments, and regular upkeep
• Commercial use - vehicles used to carry passengers for hire or reward, or to transport goods for payment, are generally excluded. This includes ride-share services such as Uber and courier or delivery work
• Cosmetic damage - paint, upholstery, and trim

Servicing is a condition of cover. Policies typically require petrol and EV vehicles to be serviced every 15,000km or 12 months, and diesel, turbo, or supercharged vehicles every 10,000km or 12 months (whichever comes first). Keeping service invoices is important - they may be required to support a claim.

MBI vs extended warranty vs GAP insurance

These three products are often mentioned together but solve different problems.

Mechanical breakdown insurance is aimed at the cost of covered mechanical and electrical failures (e.g. engine, transmission, electrical faults) that happen without an accident.

Extended warranties are contract-based repair protection. They may look similar to MBI from the buyer's side but the wording and obligations can differ significantly.

GAP insurance is not about repairing the vehicle at all. It covers the gap between an insurance pay out and the remaining loan balance if the vehicle is written off. It's a debt protection product, not a repair product.

Autosure Insurance Limited

Nomu Finance offers MBI underwritten by Autosure Insurance Limited, one of New Zealand's leading mechanical breakdown insurers. Where MBI is selected as part of a vehicle finance arrangement through Nomu, the policy is issued by Autosure and all terms, conditions, and exclusions are governed by Autosure's policy wording

What a breakdown can actually cost

Autosure Insurance Limited notes an example where a couple's car suffered a sudden mechanical failure while holidaying in the Bay of Islands. The vehicle had to be towed to Whangārei for repair, and a rental car was needed to continue the trip. Towing, repairs, and rental car costs combined to an unplanned expense of $1,700.

The example illustrates how a single breakdown rarely arrives as one invoice. Transport costs, accommodation changes, and the need to rearrange travel can quickly compound the original repair cost.

Factoring MBI into a vehicle finance decision

Where MBI is taken with finance it is an optional add-on. If selected, the premium can be added to the total amount financed so repayments stay predictable rather than paying the policy separately upfront. That also means the premium is being financed - the total loan cost should be reviewed carefully before agreeing.

The practical trade-off is certainty versus uncertainty. The premium is a known cost disclosed upfront. A major mechanical failure is uncertain - it may never happen, or it may arrive shortly after purchase. Whether MBI makes sense depends on whether the household could comfortably absorb a large unexpected repair bill without financial strain.