From Mechanic to Managing Director: Siobhan Macdonald Charts Her Course with Premium Diagnostics
Siobhan Macdonald wasn’t your average mechanic. While working long hours in a regular career, she dreamt of a better way. Leveraging her expertise as a mechanic, she saw a critical gap in the market for high-quality diagnostic tools backed by exceptional support. This vision sparked the birth of Premium Diagnostic Equipment, a thriving Australian business committed to empowering workshops and mechanics with the right tools and know-how.
This interview dives into Siobhan’s inspiring journey. Explore the valuable lessons she’s learned along the way, and the unique “superpower” that fuels her success. Discover her insights on staying ahead of the curve, the importance of delegation, and how she prioritises both mental health and intuition in her entrepreneurial path.

Could you tell us a bit about your business?
Siobhan: My business, Premium Diagnostic Equipment, specialises in supplying automotive tools, specifically diagnostic scan tools, to mechanics and workshops across Australia. We provide remote technical support to ensure our customers can effectively utilise our tools for diagnosing and repairing vehicles.
Modern cars are packed with technology, and pinpointing problems often requires specialised equipment that can communicate directly with the car’s onboard computer systems. These tools unlock a wealth of information, allowing mechanics to diagnose issues accurately and efficiently, saving time and money for both them and their customers.
What was your inspiration to take the leap and start Premium Diagnostic Equipment?
Siobhan: The inspiration to start Premium Diagnostic Equipment stemmed from feeling trapped in a demanding job, where long hours and financial stress were the norm. Drawing from my background as a mechanic, I recognised a significant gap in the market for specialised diagnostic tools.
Seeing that existing suppliers lacked adequate technical support, I took the leap to fill this void and create a business that thrived on providing both quality products and unparalleled assistance.
Can you share anything you wish you knew before starting?
Siobhan: Reflecting on my journey, I’ve realised that while there’s no handbook for navigating being a founder, there are certainly lessons I’ve picked up along the way. If I could go back, I would approach certain aspects differently. However, I’ve embraced the learning process, adapting, and growing as the business evolves.
How do you stay inspired and ahead of the curve in your industry?
Siobhan: Staying ahead in this industry is crucial. It’s about constantly learning and evolving. So, I dedicate a good chunk of my time to researching the latest advancements and trends. That means attending conferences, reading up on industry publications, and staying connected with other experts.
It’s not just about keeping up with the newest gadgets, though. I focus on understanding how these innovations can truly benefit our mechanics and workshops. By anticipating their future needs, we can proactively plan our offerings and ensure we’re providing the right solutions, even before they know they need them. That’s what keeps Premium Diagnostic Equipment at the forefront. We’re not just reacting to change, we’re actively shaping it to better serve our customers.
What advice would you give to other business owners about managing certain aspects of their business?
Siobhan: My advice to fellow business owners is simple yet crucial: recognise that you can’t do everything alone. Delegate tasks that don’t align with your strengths or passions, allowing you to focus on what truly drives you and adds value to your business.