About HD Diesel Supply

HD Diesel Supply started as a parts business and grew into something more useful: straight-talking diesel knowledge for people who actually drive and wrench on these trucks.

Who writes this

Every guide on this site is written by Mike Turner, a Red Seal certified heavy duty mechanic with 14 years of experience on Cummins, Powerstroke, and Duramax engines across Alberta and Ontario. No content farms, no copied spec sheets, no AI filler. If a guide is on this site, Mike has either done the job himself or watched it done in his shop.

What we believe

• Diagnostics before parts. Most truck owners spend money on parts they do not need. We show you how to find the real problem first.
• Honest about limits. If a job needs a shop, we say so. If a product is not worth it, we say that too.
• Built for Canada and the USA. Cold starts at minus 30, winter fuel gelling, cross-border parts — this is the reality our readers live in, so it is the reality we write about.

A note on emissions equipment

You will find educational content here about DPF, EGR, and DEF systems — how they work, how to maintain them, and how to troubleshoot them. We do not sell, recommend, or link to emissions defeat devices. Tampering with emissions equipment on road-going vehicles is illegal in both Canada and the United States, with serious fines. Our focus is keeping your truck running right with its emissions systems intact.