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Base Oil Group – III
4cSt

Description:
Group III – 4 cSt is a light viscosity, synthetic-grade base oil manufactured through severe hydrocracking and hydroisomerization of high-quality paraffinic crude. With a viscosity of approximately 4 centistokes at 100°C, this ultra-pure base stock combines high viscosity index, exceptional oxidative stability, and low volatility, making it ideal for modern passenger car motor oils, transmission fluids, and low-viscosity industrial lubricants. Its excellent cold-flow behavior and thermal resistance support demanding formulations that meet or exceed the latest API SP, ILSAC GF-6, and OEM performance standards.

Production Process:

  • Severe Hydrocracking & Hydroisomerization: Ensures high saturate content and removes sulfur and aromatics

  • Hydrofinishing: Refines color, clarity, and long-term stability

  • Precise Fractionation: Guarantees consistent viscosity control for blending accuracy

Key Technical Properties (Typical Values):

  • Kinematic Viscosity @ 100°C: ~3.8–4.3 cSt

  • Viscosity Index (VI): ≥ 120 (often 125–135)

  • Flash Point (COC): >210°C

  • Pour Point: -24°C to -30°C

  • Color (ASTM D1500): L0.5 (water-clear)

  • Sulfur Content: ≤ 0.03%

  • Saturates: ≥ 90%

  • Oxidation Stability: Excellent

  • Volatility (NOACK): Very low – suitable for low-oil-consumption formulations

Benefits:

  • Ideal for low- and mid-viscosity engine oil grades (e.g., SAE 0W-20, 5W-30)

  • Supports fuel economy and reduced emissions in high-efficiency engines

  • Excellent thermal and oxidative stability for extended drain intervals

  • Superior cold flow performance for reliable engine protection in cold climates

  • High chemical purity ensures excellent additive compatibility

  • Water-clear color and consistent quality for synthetic and semi-synthetic formulations

Applications:

  • Passenger Car Motor Oils (PCMO): For gasoline and hybrid vehicles, including full synthetic formulations

  • Heavy-Duty Engine Oils (HDEO): As a low-viscosity blending stock in multigrade oils

  • Automatic Transmission Fluids (ATF): Where shear stability and oxidation resistance are essential

  • Industrial Lubricants: Hydraulic, compressor, and circulating oils operating under variable temperatures

  • Grease Production: Where a light, clean base oil is required

  • OEM-Approved Lubricants: Blending base for lubricants meeting ACEA, API, and global emission standards

Packaging Options:

  • Available in bulk, IBCs (totes), 200-liter drums, and flexitanks

  • Custom formulation support and private-label packaging options offered

Compliance & Standards:

  • Meets all API Group III base oil specifications

  • Suitable for use in lubricants formulated to meet API SN, SP, ILSAC GF-6/7, ACEA C5, and major OEM approvals

  • Fully compatible with Group II, Group III+, PAO, and synthetic esters

Product data sheets can be downloaded from the following link(s):

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