20W40 Engine Oil Formulation | Lubechem Consultant
At Lubechem Consultant, we provide complete formulation solutions for SAE 20W40 multigrade engine oil, suitable for both gasoline and diesel engines operating in warm to moderate climates. Our formulations are aligned with key API performance standards such as API SG/CF, SJ/CF, or SL/CF, depending on additive package selection.
Engineered for optimal viscosity performance, wear protection, and detergent-dispersant balance, our 20W40 formulation is ideal for mixed fleet applications, older vehicles, or regions where multigrade monsoon-resistant oils are preferred.
Formulation Features
Our 20W40 formulation is based on a carefully optimized blend of high-quality base oils (Group I SN500 or SN150 + bright stock or recycled) and a multifunctional additive package. Key formulation elements include:
Zinc Dialkyldithiophosphate (ZDDP) for anti-wear and oxidation control
Viscosity Index Improvers (VII) to ensure performance across temperature variations
Overbased Calcium Sulfonate for superior detergency and TBN retention
Pour Point Depressants & Anti-foam agents for operational reliability
This blend offers excellent thermal stability, sludge prevention, and protection in stop-and-go traffic conditions or under heavy engine loads.
We Assist You In:
Selecting appropriate base oil combinations (virgin/recycled)
Choosing & sourcing cost-effective additive packages
Designing a lab-scale or commercial blending process
Achieving API SG/CF to SL/CF compliance
Providing technical documentation, lab testing methods, and hands-on training
Technical Specifications for 20W40 Engine Oil
| Parameter | Typical Range | Test Method |
|---|---|---|
| API Performance Level | SG/CF, SJ/CF, SL/CF | API Classification |
| Viscosity @ 40°C (cSt) | 110 – 135 | ASTM D445 |
| Viscosity @ 100°C (cSt) | 14.0 – 15.5 | ASTM D445 |
| Viscosity Index (VI) | 120 – 135 | ASTM D2270 |
| CCS Viscosity @ -15°C (cP) | ≤ 7000 | ASTM D5293 |
| Flash Point (°C) | 220 – 240 | ASTM D92 |
| Pour Point (°C) | -12 to -15 | ASTM D97 |
| TBN (mg KOH/g) | 5 – 9 | ASTM D2896 |
| Density @ 15°C (g/cm³) | 0.880 – 0.900 | ASTM D4052 |
| Sulphated Ash (% wt) | 0.9 – 1.2 | ASTM D874 |
| Foaming Characteristics | Pass (Seq I, II, III) | ASTM D892 |
| Noack Volatility (%) | ≤ 10 | ASTM D5800 |
| Copper Strip Corrosion | 1A | ASTM D130 |
| Color | L 3.5 max | ASTM D1500 |
Why Choose Our 20W40 Formulation?
Suitable for mixed fleet (gasoline & diesel) applications
Designed for extended drain intervals and urban driving stress
Customizable with cost-effective base oil & additive options
Complies with API SG/CF to SL/CF performance levels
Full support in blending, lab testing & production scale-up