Sinclair Natural Gas Low Ash SAE 40 Engine Oil

Sinclair Natural Gas Engine Oil Heavy Duty Engine Oil

Get the friction management and unbeatable protection you need with Sinclair Natural Gas Low Ash SAE 40 Engine Oil.

Designed exclusively for use in medium-to high-RPM engines that are fueled by pipeline natural gas, processed natural gas, or other gases that may contain corrosive materials, Sinclair Natural Gas Low Ash SAE 40 Engine Oil delivers benefits like:

  • Oxidation resistance, with thermally stable base oils with high VI formulations.
  • Outstanding oil oxidation life.
  • Powerful protection against engine component wear.
  • Exceptional degree of deposit control for low-ash oils with efficient neutralization of combustion’s corrosive byproducts.
  • Exhaust valve seat and face wear is reduced during severe operation via significant valve cushioning additive components.
  • Meeting Non-Selective Catalytic Reduction (NSCR) catalyst compatibility requirements.

Better Anti-Friction and Anti-Wear Composition

The chemical makeup of Sinclair Natural Gas Low Ash SAE 40 Engine Oil gives you control of wear and friction, with molecules that actually bond to form a protective shield.

Performance You'll Notice

Equipment designs are evolving, and operation conditions continues to grow more and more severe. And you need a brand that’s evolved as well: Sinclair. With over a century’s worth of experience, we continue to develop and evolve advanced oils that meet today’s demanding operating environment.

Sinclair Natural Gas Engine Oil is specially engineered and formulated to provide:


  • Neutralize corrosion with low-ash oils.


  • Tremendous deposit control.
  • Unsurpassed wear protection.


  • Formulated for long life and lasting thermal stability.


Designed, formulated and blended for use in heavy-duty four-stroke engines operating on pipeline quality natural gas under high load conditions year-round. Also recommended for high-speed four-stroke gas engines used in cogeneration applications and for engines fueled by synthetic gas. Can be used with fuels containing low levels of sulfur and Chloro-Fluoro Carbons (CFCs). Typical applications where low-ash natural gas engine oils include:

  • Natural gas compression and transmission.
  • Wellhead gas pumpers.
  • Oil pumpers.
  • Irrigation systems.
  • Total energy systems.
  • Waste water treatment cogeneration plants.
  • Landfill gas cogeneration systems.
  • Manure gas cogeneration.

Typical Properties

Color ASTM D1500 2
Flash Point °C ASTM D92 220
Flash Point °F ASTM D92 428
Gravity, °API ASTM D287 29.85
Phosphorus, wt. % ASTM D5185 0.025
Pour Point °C (°F) ASTM D5950 -27°C (-17°F)
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.877
Sulfated Ash, wt. % ASTM D874 0.46
TBN, mgKOH/g ASTM D2896 5.7
Viscosity @ 100°C cSt ASTM D445 13.58
Viscosity @ 40°C cSt ASTM D445 134.65
Viscosity Index ASTM D2270 96
Zinc, wt. % ASTM D5185 0.027

Container/Bulk Availability

55 Gallon Drum Product Number - 569-003
Available in Bulk