• Mixed fleets of diesel engines (high speed, four-stroke, turbocharged or naturally aspirated)
• Commercial road transport
• Off-highway vehicles and plant
• Agricultural tractors and farm machinery
• High speed diesel engines in marine service (e.g. fishing, river transport, etc.)
• Generator sets
• Mobile hydraulic systems (where oil type and viscosity are appropriate)

• API CG-4, Allison C-4, CAT TO-4