Amsoil
Amsoil has a complete line of diesel engine synthetic oils. The line features the Signature Series Max-Duty Synthetic in 5W-40, 5W-30, 10W-30, 15W-40, and 0W-40 grades. The line also includes Heavy-Duty Synthetic in 15W-40, 5W40, 10W-30 blends. The oils feature extreme-pressure protection and six times more wear protection while maintaining viscosity, maximizing fuel efficiency, and minimizing oil consumption. The Signature Series performs well in extreme temperatures. Amsoil also carries a line of filters, diesel additives, and injection cleaners.
Castrol
See also: Fluid analysis is more important than ever
Cenex
Chevron
Citgo
Hot Shot's Secret
Mobil Delvac/Exxon Mobil
Phillips 66
Shell Rotella
See also: Shell Starship transitioning to natural gas