AMSOIL 100% SYNTHETIC STATIONARY NATURAL GAS ENGINE OIL

AMSOIL 100% Synthetic Stationary Natural Gas Engine Oil is a purpose-built SAE 20W-40 lubricant designed to deliver extended service life and superior protection in stationary natural gas engines. Its shear-stable, multi-grade formulation covers a broad ambient temperature range, eliminating the need for seasonal oil changes in power generation, compression, and cogeneration applications.

Stationary natural gas engines operate under demanding conditions that conventional lubricants struggle to handle. Continuous high-temperature operation accelerates oil degradation and nitration, while combustion byproducts generate acidic compounds that attack metal surfaces. Low-ash requirements add another layer of complexity, as the lubricant must protect against wear and corrosion without contributing to deposit buildup or catalyst contamination.

CONTROLS WEAR AND REDUCES DEPOSITS
Carbon deposits and port blockage are persistent problems in stationary natural gas engines running around the clock. AMSOIL Synthetic Stationary Natural Gas Engine Oil is formulated with a sulfated ash content of just 0.46%, well under the 0.50% low-ash threshold. This minimizes deposit formation while advanced anti-wear and anti-scuff additives protect valve seats, piston rings, cylinder liners, and bearings. The Four-Ball Wear Test (ASTM D4172) returned a scar diameter of just 0.35 mm, confirming strong boundary-layer protection under metal-to-metal contact conditions.

EXCEPTIONAL VISCOSITY CONTROL OVER THOUSANDS OF HOURS
Oil that thickens or shears down during extended service intervals creates efficiency losses and accelerates component wear. AMSOIL Synthetic Stationary Natural Gas Engine Oil maintains viscosity stability well beyond typical drain intervals, with field validation data showing consistent kinematic viscosity readings across thousands of operating hours. The oil's viscosity index of 149 (ASTM D2270) reflects its ability to maintain a stable lubricating film across wide temperature swings, from cold startups to sustained full-load operation. At operating temperature, the oil delivers a High-Temperature/High-Shear viscosity of 4.3 cP (ASTM D5481), providing reliable film strength where it counts.

RESISTS NITRATION FOR LONGER OIL LIFE
Nitration is one of the primary failure modes for lubricants in natural gas engines. Nitrogen oxides produced during combustion react with the oil, causing it to thicken and form varnish. This drives up operating temperatures and reduces efficiency. AMSOIL Synthetic Stationary Natural Gas Engine Oil is naturally resistant to nitration thanks to its 100% synthetic base oil chemistry, which resists the oxidation pathways that accelerate nitration buildup.

PROTECTS EMISSION CATALYST SYSTEMS
Zinc and phosphorus are effective anti-wear agents, but in excess they poison catalytic converters and oxidation catalysts used in emission control systems. AMSOIL Synthetic Stationary Natural Gas Engine Oil is formulated with carefully controlled zinc and phosphorus levels to extend catalyst life without compromising wear protection. For operators managing emission compliance on Waukesha, Caterpillar, Jenbacher, or other stationary natural gas engines equipped with catalyst systems, this balanced formulation reduces a significant source of catalyst degradation.

KEEPS ENGINES CLEAN WITH HIGH TBN RETENTION
Acidic byproducts from combustion gradually deplete an oil's total base number (TBN), reducing its ability to neutralize corrosive compounds. AMSOIL Synthetic Stationary Natural Gas Engine Oil starts with a TBN of 5.7 and is engineered to retain alkalinity over extended drain intervals. Field monitoring data shows TBN remaining well above condemning limits even after thousands of hours of operation, while total acid number (TAN) stays controlled. This balance between acid neutralization and low ash content is critical in natural gas engine applications.

APPLICATIONS
AMSOIL Synthetic Stationary Natural Gas Engine Oil is recommended for use in stationary four-stroke and two-stroke engines that require low-ash (less than 0.50%) engine oil and are fueled by natural gas. This includes generators, compressors, cogeneration units, and pump-drive engines from manufacturers such as Caterpillar, Waukesha, Cummins, and Jenbacher. It should not be used in vehicular applications running on propane or natural gas.

COMPATIBILITY
This oil is compatible with conventional petroleum oils and other synthetic lubricants. However, mixing with other oils will shorten oil life and reduce the performance benefits of the synthetic formulation. Aftermarket oil additives are not recommended.

SERVICE LIFE
Extensive monitoring by oil analysis has demonstrated that drain intervals can be safely extended beyond OEM recommendations with AMSOIL Synthetic Stationary Natural Gas Engine Oil. Oil analysis should be used to determine optimal drain intervals for each specific application and operating condition. When extending drains, change the oil filter at the equipment manufacturer's recommended interval.