Who we are

Collett Diesels is a locally owned and operated diesel-mechanic business servicing Tauranga, Mount Maunganui, and the wider Bay of Plenty. We’re built on hard work, honesty, and real-world experience - combining technical know-how with a straight-up approach that drivers and fleet owners can rely on.

With over 15 years in the heavy-diesel industry, we’ve worked across everything from long-haul truck and trailers to utes, trailers, and heavy equipment. Our focus is simple - deliver reliable, first-time fixes and keep our customers safely on the road with as little downtime as possible.

We’re a family-run business, which means every job matters to us. We take pride in the details, stand by our workmanship, and build long-term relationships based on trust, quality, and genuine service.

our difference

Local, flexible, and fully mobile

We’re born-and-bred locals who work around your schedule, not the other way around. Our service is fully mobile, available after hours, and delivered wherever your vehicle is. No workshop delays, no rigid timeframes - just practical support when and where you need it.

Personal, relationship-driven service

We take the time to understand your whole setup. Whether it’s a truck, ute, trailer, or machine. Our goal is to be your all-in-one diesel partner, building long-term trust through honest advice, reliable workmanship, and a straight-up approach to every job.

one person from start to finish

When you call Collett Diesels, the same person who answers the phone is the one who turns up and fixes the job. No handovers, no confusion, and no repeating yourself. You get consistent communication, clear explanations, and a mechanic who knows your vehicle’s history inside out.

Efficient, cost-effective with modern tools

With low overheads, advanced diagnostic tools, and over 15 years’ experience, we offer efficient, accurate repairs without dealership pricing. Our scan tools allow quick fault identification across all major truck brands, reducing downtime, unnecessary part swaps, and repeat visits.

Meet the Team

Get to know us - the people behind the business who keeps Collett Diesels running and our customers on the road.

  • Owner & Operator

    With more than 15 years in the heavy-diesel industry, Grant brings deep hands-on experience across American, European, and Japanese trucks. He’s a qualified diesel technician with specialist training in diagnostics, engine systems, and driveline repairs.

    He’s known for being thorough, practical, and straight-up; someone who explains things clearly and takes pride in getting it right the first time.

    When you call Collett Diesels, Grant is the one who turns up, tools in hand, ready to sort the issue and get you moving again.

  • Marketing & Operations

    Tanya keeps the business running smoothly behind the scenes. With over 16 years in marketing and operations, she handles bookings, accounts, customer communication, and the overall day-to-day management of Collett Diesels.

    She brings a polished, organised approach to the business, making sure customers get clear updates, reliable service, and a professional experience from start to finish.

    Together with Grant, she helps shape a business that’s local, honest, and easy to deal with.

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.