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CNG ENGINE OIL

Typical Properties 

Property Typical Value Test Method
Viscosity Grade SAE 15W-40 SAE J300
Kinematic Viscosity @ 100°C 14.5 – 15.5 cSt ASTM D445
Kinematic Viscosity @ 40°C 105 – 120 cSt ASTM D445
Viscosity Index ≥ 135 ASTM D2270
Pour Point -27°C to -30°C ASTM D97
Flash Point (COC) > 220°C ASTM D92
TBN (Total Base Number) 5 – 7 mg KOH/g ASTM D2896
Sulfated Ash ≤ 0.6 wt% ASTM D874
Foaming Characteristics Pass (Seq I, II, III) ASTM D892
Density @ 15°C ~0.88 – 0.89 g/cm³ ASTM D4052
Zinc (as ZDDP) Present (anti-wear additive)

Key Performance Criteria:

  • Low Ash Content: Protects emission systems.

  • Thermal & Oxidation Stability: Withstands high combustion temps of CNG.

  • Wear Protection: Prevents valve seat recession and piston ring wear.

  • Deposit Control: Keeps combustion chamber and piston clean.

CNG Engine Oil refers to a special type of lubricating oil formulated specifically for engines that run on Compressed Natural Gas (CNG). These engines operate under different conditions compared to petrol or diesel engines, and they require engine oils that address their unique needs.

Key Features of CNG Engine Oil:

  1. High Oxidation Stability: CNG combustion produces higher combustion temperatures, which can oxidize oil faster. CNG oils are designed to resist this.

  2. Low Ash Formulation: CNG engines are sensitive to ash buildup which can damage components and catalytic converters. Hence, CNG oils often have low sulfated ash content.

  3. Detergent/Dispersant Additives: Help to keep the engine clean and free of carbon deposits.

  4. Enhanced Valve Protection: CNG combustion can cause increased wear on valve seats, so additives in CNG oil often address this.

  5. Low Volatility: Reduces oil consumption and evaporative losses at high temperatures.

Common Viscosity Grades:

  • SAE 15W-40

  • SAE 20W-50 (in warmer climates)

  • Some synthetic options like SAE 5W-30 are also available for high-performance or newer engines.

Applications:

  • CNG-powered cars, buses, auto-rickshaws, and light commercial vehicles.

  • Fleet operations where clean combustion and long oil life are critical.

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