Benz Injection specializes in rebuilding and supplying parts for classic Mercedes-Benz diesel engines. They focus on injectors for engines like the OM615, OM617, OM601, and OM606. Over time, the company expanded to include injection pumps, larger pump elements, turbo kits, ECU tuning, rods, and complete engines. Their products and services cater to enthusiasts of Mercedes-Benz diesel vehicles, with a particular focus on performance upgrades and restoration.