GEO S 40

Premium Quality Natural Gas Engine Oil
Petronas GEO S 40 is a heavy-duty, low-ash, premium quality gas engine oil specifically designed for the lubrication of a wide range of spark-ignited gas-fuelled engines.
Specially formulated with premium quality unconventional base oil and advanced high performance detergent-dispersant additives technology to provide excellent chemical and thermal stability, excellent resistance to oxidation and nitration, excellent sludge and ash deposits control, superior engine cleanliness and excellent anti-corrosion properties.
Its advanced additive technology also minimize wear of rings, liners and bearing and curtails valve seat wear in turbocharges four cycle engines.
Customer Benefits
  • Excellent piston and engine cleanliness for long, efficient operation and reduced overhaul costs.
  • Optimise reserve alkalinity level (TBN of 5.6) to neutralise acids and provide enhanced corrosion protection.
  • Exceptional oxidation and nitration resistance minimizes oil thickening, particularly under leaner air/fuel ratios and resist oil filter blockage. Also minimizes acid number increase, providing protection against bearing corrosion.
  • Balanced / optimized sulphated ash level to provide enhanced valve recession protection in four-stroke engines.
  • Excellent thermal stability and resistance to coking.
  • Low phosphorous content ensures NSCR-type exhaust system catalysts compatibility to prolong unit's service life.
Find out what the PETRONAS Fluid Technology SolutionsTM can do for your business

Applications Recommended for use in the lubrication of the crankcase and power and compression cylinders of spark-ignited two-stroke and four stroke gas-fuelled (natural gas or LPG) engines made by Caterpillar, Waukesha, Dresser Rand and other gas engines.
  • API CF
  • Caterpillar gas engine requirments
  • Dresser Rand Category 3 Requirements
  • Waukhesha low ash defination
Product Typicals
Characteristics SAE 40
Density @ 15 °C, kg/l 0.8830
Pour Point, °C -12
Flash Point, °C 240
Kinematic Viscosity, cSt  
@ 40 °C 133.7
@ 100 °C 14.5
Viscosity Index 108
Sulphated Ash, %wt 0.46
Total Base Number, mg KOH/g 5.6
ASTM Colour 2.0
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