Marcus Reid

Diesel Technician & Senior Contributor

Marcus spent two decades in independent diesel shops before moving into writing, working mostly on Power Stroke, Cummins and Duramax pickups along with the RVs and farm equipment that came through the same bays. At USA Diesel Finder he covers diagnostics, DPF and emissions systems, and the practical side of choosing a shop — what a fair estimate looks like, which symptoms can wait, and which ones can't. His goal is to give owners enough context to have a confident conversation with their mechanic.

Articles by Marcus Reid

Diesel fuel sign on metal pipes against a dark black background at night.
Maintenance
7 min read

Diesel Fuel Explained: Cetane, Gelling and Storage Life

Diesel fuel isn't one simple liquid — cetane rating, temperature, and age all change how it burns and how long it lasts. Learn what cetane number really measures, why diesel gels in cold weather, how to prevent it, and how long you can safely store fuel before it breaks down.

A vibrant orange Freightliner truck drives on a highway through a dry, scenic landscape in El Salvador.
Maintenance
7 min read

Diesel Engine Families Explained: Power Stroke, Cummins & 3.0 Duramax

Ford Power Stroke, Ram Cummins, and GM Duramax — including the light-duty 3.0 Duramax — each follow different service intervals and wear patterns. Here's what sets them apart and how to keep each one running right.

A diesel pickup truck on an open interstate highway
State Regulations
7 min read

Diesel Emissions Rules by State: What Pickup, RV and Fleet Owners Need to Know

Which diesel emissions rules are federal, which states test, and how to keep a Power Stroke, Cummins or Duramax legal without losing reliability.