AMSOIL 100% SYNTHETIC VEHICULAR NATURAL GAS ENGINE OIL

AMSOIL 100% Synthetic Vehicular Natural Gas Engine Oil is a purpose-built SAE 15W-40 low-ash lubricant designed to protect CNG, LNG, and LPG-fueled engines in transit buses, refuse haulers, school buses, medium and heavy-duty trucks, and delivery vehicles. It delivers the specific combination of wear protection, deposit control, and acid neutralization that natural gas engines demand.

Natural gas engines present a unique set of lubrication challenges. They run hotter than their diesel counterparts, produce different combustion byproducts, and place extreme stress on valvetrains. Standard diesel oils are not formulated to address these conditions. Low-ash requirements add another layer of complexity, because reducing ash content typically weakens an oil's ability to fight valve recession and neutralize acids. The lubricant has to strike a precise balance, and most conventional natural gas engine oils fall short in one area or another.

PROTECTS AGAINST VALVETRAIN WEAR IN CNG AND LNG ENGINES
Natural gas engines equipped with either roller or slider followers are subject to high contact pressures that accelerate valvetrain component wear. AMSOIL Synthetic Vehicular Natural Gas Engine Oil is formulated with high levels of zinc and phosphorus anti-wear additives on a synthetic base oil platform. This combination provides enhanced metal-to-metal protection in the valve train, particularly in applications requiring the Cummins CES 20074 specification. The Four-Ball Wear Test (ASTM D4172) result of 0.44 mm scar diameter confirms the oil's ability to minimize surface contact damage under load.

FIGHTS VALVE RECESSION AND MINIMIZES COMBUSTION CHAMBER DEPOSITS
Valve recession is one of the most persistent problems in natural gas engine maintenance. Low-ash oils are required to protect emissions equipment, but reduced ash levels often mean less cushioning at the valve seat interface. AMSOIL addresses this with a balanced formulation that keeps sulfated ash content at just 0.58 wt%, low enough to minimize valve stem and combustion chamber deposit formation while still providing the physical protection needed to reduce valve recession. This is the tradeoff most fleet managers struggle with, and AMSOIL's formula handles both sides of it.

MAINTAINS A HIGH TBN FOR ACID NEUTRALIZATION
Natural gas combustion produces acidic byproducts that degrade oil and corrode internal engine surfaces over time. AMSOIL Synthetic Vehicular Natural Gas Engine Oil carries a Total Base Number (TBN) of 5.84, giving it substantial acid-neutralizing capacity despite the low-ash formulation. The Total Acid Number (TAN) starts at just 1.05, which means there is a wide margin between TBN and TAN at the point of fill. That margin is what allows the oil to neutralize acids over extended service intervals without losing its protective reserve.

RESISTS VISCOSITY BREAKDOWN UNDER HIGH HEAT AND HEAVY LOADS
CNG-fueled transit buses and refuse trucks operate under constant stop-and-go conditions that generate sustained high temperatures. Viscosity loss under these conditions means reduced film strength and accelerated wear. AMSOIL's shear-stable synthetic formula loses only 6.7% in the NOACK volatility test (ASTM D5800), demonstrating strong resistance to evaporative loss. The viscosity index of 155 reflects excellent viscosity retention across a broad temperature range, from cold starts at -20°C (where cranking simulator viscosity measures 4730 cP per ASTM D5293) through sustained high-temperature operation at 100°C (14.5 cSt per ASTM D445). Lower oil consumption translates directly to less frequent top-offs and reduced emissions equipment fouling.

CAPABLE OF EXTENDED DRAIN INTERVALS WITH OIL ANALYSIS
AMSOIL Synthetic Vehicular Natural Gas Engine Oil is engineered as a long-life lubricant. Drain intervals can be extended beyond OEM recommendations when carefully monitored through a regular oil analysis program. When extending drain intervals, oil filters should still be changed at the engine manufacturer's recommended interval. For fleet operations running CNG-powered Cummins engines in transit or refuse applications, this approach can reduce both maintenance downtime and lubricant costs per mile.

Specifications and Compatibility
This oil is formulated for applications requiring the Cummins CES 20074 specification. It is recommended for all mobile equipment fueled by compressed natural gas (CNG), liquefied natural gas (LNG), or liquefied petroleum gas (LPG). It is compatible with conventional petroleum oils and other synthetic lubricants, though mixing with other oils will reduce the performance and service life benefits. Aftermarket engine oil additives are not recommended.

Service Life
Extended drain intervals are supported when monitored by oil analysis. Follow the engine manufacturer's recommended filter change interval even when extending the oil drain. Consult oil analysis results to determine the appropriate drain interval for your specific operating conditions and duty cycle.