PETRONAS Geo SYN 40 is a supreme-performance natural gas engine oil engineered with PETRONAS ETRO Plus base oil technology
| Parameter | Standard | Typical Value | Performance Impact |
| SAE Viscosity Grade | — | 40 | Heavy-duty viscosity standard for industrial gas engines |
| Specific Gravity @ 15°C | ASTM D 4052 | 0.875 | Ensures optimal density and fluid balance under pressure |
| Kinematic Viscosity @ 40°C | ASTM D 445 | 118.3 cSt | Guarantees protective lubrication film during engine startup |
| Kinematic Viscosity @ 100°C | ASTM D 445 | 13.55 cSt | Maintains film strength under peak operating temperatures |
| Viscosity Index (VI) | ASTM D 2270 | 111 | High thermal resistance prevents oil thinning across duty cycles |
| Flash Point (COC) | ASTM D 92 | 250°C | High thermal endurance prevents in-service fluid evaporation |
| Pour Point | ASTM D 97 | -36°C | Excellent cold-flow properties for low-temperature circulation |
| Total Base Number (TBN) | ASTM D 2896 | 7.0 mg KOH/g | Strong reserve alkalinity neutralizes acidic combustion gases |
| Total Acid Number (TAN) | ASTM D 664 | 1.1 mg KOH/g | Low base acidity extends fluid life prior to degradation |
| Sulphated Ash | ASTM D 874 | 0.54% | Low-ash formulation prevents combustion chamber deposits |
| Foam Sequence I | ASTM D 892 | 0/0 mL | Complete foam inhibition maintains continuous oil pressure |
| Category | Specifications & Approvals |
| OEM Approvals | INNIO Jenbacher: Class A, Type 2, 3, 4, 6, and J624 2-stage turbocharged engines (Aluminum & Steel pistons) |
| Performance Level | Caterpillar: CAT G3516H |
| Engine Configurations | Medium-to-high speed 4-cycle lean-burn and stoichiometric gas engines |
| Fuel Compatibility | Optimized for natural gas containing low levels of sulfur or chlorine |
Engineered for Extended ODI: Advanced ETRO Plus base oil drastically reduces oxidation and nitration, keeping filters clean and extending oil drain intervals
Deposit & Ash Control: Low-ash chemistry (0.54%) prevents valve recessing, pre-ignition, and piston deposit buildup
Environmental Compliance: TPP-free additive package meets modern emission guidelines without compromising component protection
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