Engines for the Oil & Gas Market

Durability and performance you demand.

Made to thrive in challenging environments.

Kubota engines deliver durability, versatility and flexibility for wellhead gas operations.


  • Natural gas engines feature many of the same components found in our heavy-duty industrial diesel engines.


  • Power artificial lift systems, vapor recovery units, compressors, generators and more.

Features & Benefits

Zero-Maintenance Valve Timing Control

Standard on Kubota WG2503 and WG3800 engines, the rugged helical front gear train is a zero-maintenance, heavy-duty valve timing control that is superior to timing belt or chain designs.

Water-Resistant Ignition-System Connectors

For trouble-free operation in all climates, the state-of-the-art ignition system includes tough, water-resistant connectors to ensure an easy startup, day after day.

Premium Valve Materials with Cast Iron Cylinder Head

High-temperature alloy exhaust valves and seats are fitted into our robust cast iron cylinder head for reliable engine life. These wear and corrosion-resistant parts are especially important for wellhead duty.

Manufacturer of Record

Kubota is the manufacturer of record for this family of engines, providing a turnkey engine solution that meets current emissions regulations.

Knock Protection

A knock sensor in WG2503 and WG3800 engines protects from damage caused by detonation or knock caused by fixed spark advance.

Coil-On-Plug Ignition

The coil-on-plug design on Kubota WG2503 and WG3800 engines eliminates spark plug wires, increasing reliability and lowering your maintenance costs.

Variable Speed Engines

Fuel TypeNatural GasLPGLPGLPG
Engine TypeVariableVariable VariableVariable
Maximum Output (Gross Int SAE J1995) 42.4 kW (56.8 HP)46.0 kW (61.7 HP65.0 kW (87.1 HP)70.0 kW (93.8 HP)
Maximum Output (Net Int SAE J1349)158 Nm (117 lbf·ft) / 1200 rpm | 158 Nm (117 lbf·ft) / 1200 rpm |262.0 Nm (193.2 lbf·ft) / 1200 rpm262.0 Nm (193.2 lbf·ft) / 1200 rpm
Maximum Output (Net Cont. SAE J1349)173.7 Nm (128.1 lbf·ft) / 1400 rpm173.7 Nm (128.1 lbf·ft) / 1400 rpm282.5 Nm (208.4 lbf·ft) / 1200 rpm282.5 Nm (208.4 lbf·ft) / 1200 rpm
Rated Speed2700 RPM2700 RPM 2700 RPM2700 RPM

Generator Drive Engines

Fuel TypeNatural GasLPGNatural GasLPG
Engine TypeGeneratorGeneratorGeneratorGenerator
Continuous Output (50 Hz / Fixed Speed)20.7 kW (27.8 HP)23.1 kW (31.0 HP) 34.3 kW (46.0 HP)37.0 kW (49.6 HP)
Rated Speed 1500 RPM1500 RPM1500 RPM1500 RPM
Continuous Output (60 Hz / Fixed Speed)24.4 kW (32.7 HP)24.8 kW (33.2 HP ) 40.7 kW (54.6 HP) 43.8 kW (58.7 HP)
Rated Speed1800 RPM1800 RPM1800 RPM1800 RPM