reliable diesel services. anywhere.
Collett Diesels is your fully mobile heavy-diesel specialist, servicing the entire Bay of Plenty and beyond. From full COF repairs and scheduled maintenance to advanced diagnostics and 24/7 roadside call-outs, we’ve got the tools and know-how to get you moving — fast.
who we are
We’re a locally owned and operated diesel-mechanic business built on hard work, honesty, and real-world experience.
With over 15 years under the bonnet, we deliver fast, reliable repairs and maintenance for heavy vehicles across the Bay — done safely and done right the first time.
Our services
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Engine Fault Diagnosis
Using modern diagnostic scan tools, we quickly identify and fix faults behind warning lights and performance issues. Accurate readings mean faster repairs and less downtime.
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COF Repairs
If your truck fails its Certificate of Fitness, we handle the fixes — from steering joints and brakes to oil leaks and suspension. We’ll get you compliant and road-ready fast.
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24/7 Breakdown Service
Stuck roadside? We’ll travel anywhere across the Bay and beyond to get you moving again. From electrical and coolant issues to air leaks and belts. We sort it on-site, anytime.
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Maintenance & Servicing
Regular servicing keeps you earning. We handle A services (minor), B services (oil & lube), and drive-line services (gearbox & diff) on schedule.
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Engine & Drive-line Repairs
From full engine rebuilds to gearbox and clutch repairs, we’ve got the skill and gear to do the job right, without dealership downtime.
Contact us.
Ready to book a service or stuck on the side of the road? Whether it’s a quick question, a COF repair, or an urgent breakdown, tell us what you need below — we’ll get back to you fast and get you back on the road.
Prefer to talk? Call or text 020 4101 3234 for 24/7 support.