CODEX 15W40 DIESEL ENGINE OIL CJ-4

CODEX 15W40 DIESEL ENGINE OIL CJ-4

Codex Diesel Engine Oil 15W40 API CJ-4 is a specific type of engine oil designed for use in diesel engines.

Let’s break down what each part of this designation means:

  1. Viscosity Rating (15W40): The “15W” in 15W40 stands for the oil’s viscosity characteristics. In this case, “15W” means that the oil has a lower viscosity (flows more easily) at low temperatures, making it suitable for cold weather conditions. The “40” means that the oil has a higher viscosity (thickness) at high temperatures, providing adequate protection for the engine when it’s operating at elevated temperatures. This oil is often used in a wide range of temperatures, making it versatile for various climates and applications.
  2. API (American Petroleum Institute): API is an organization that establishes standards for engine oils and other petroleum products. The API classification system provides information about the performance and quality of engine oils. The “CJ-4” designation is an API service category specifically designed for diesel engines.
    • CJ-4: API CJ-4 represents a high-quality engine oil formulated for use in modern diesel engines. CJ-4 oils are designed to meet stringent emission standards and provide superior protection against wear, deposits, and soot buildup. They offer improved oxidation resistance and are suitable for engines using low-sulfur diesel fuel.

API CJ-4 oils are commonly used in on-highway diesel engines, such as those found in trucks and buses, as well as off-highway diesel engines used in construction, agriculture, and industrial applications.

It’s important to use the correct API service category recommended by your diesel engine manufacturer to ensure optimal engine performance and longevity. Always refer to your engine’s owner’s manual or consult the manufacturer’s guidelines to determine the appropriate oil specification for your specific diesel engine. Using the right oil is essential for maintaining the engine’s efficiency and durability.

Category:

Description

CODEX Heavy Duty Diesel Engine Oil
SAE 15W-40 | API SN/CH-4
Premium Grade Diesel Engine Oil

Product Overview:
Codex Heavy Duty Diesel Engine Oil SAE 15W-40 is a high-performance, premium-grade lubricant formulated to meet the demanding needs of both diesel and gasoline engines. Blended with advanced additive technology, it meets API SN/CH-4 standards and ensures superior protection under high-load and high-temperature conditions.

Key Features:

  • Advanced wear protection for extended engine life

  • Excellent soot control and piston cleanliness

  • Outstanding resistance to oxidation and thermal breakdown

  • Suitable for both turbocharged and naturally aspirated engines

  • Compatible with modern emission control systems

Applications:
Recommended for use in commercial trucks, buses, off-road equipment, construction machinery, and industrial diesel engines operating under severe service conditions

2. Why Fuel Efficiency Matters

Every 1 km/L improvement in fuel economy:

  • Reduces the liters consumed per kilometer

  • Lowers the monthly/annual fuel spend directly

  • Frees up budget for maintenance or expansion

  • Delivers a rapid return on investment when paired with premium lubricants or engine oils designed for fuel savings

3. Quantitative Case Study

Assumptions:

  • Annual distance per vehicle: 100,000 km

  • Baseline efficiency: 5.0 km/L

  • Improved efficiency: 5.5 km/L (10% gain)

  • Diesel price: Tk 104 per L (as of May 12, 2025) GlobalPetrolPrices.comThe Daily Star

Metric Baseline (5.0 km/L) Improved (5.5 km/L)
Liters consumed per year 20,000 L 18,181 L
Annual fuel cost Tk 2,080,000 Tk 1,890,909
Annual savings per vehicle Tk 189,091
Savings as % of fuel spend 9.1 %

Interpretation:

  • A 10 % fuel‐economy gain saves ~Tk 189,000 per vehicle each year.

  • Across a 50-truck fleet, that’s Tk 9.45 million in annual savings.

4. Impact on Overall TCO

  • If fuel is ~25 % of TCO, a 9 % reduction in fuel spend cuts TCO by about 2.3 % overall.

  • In high-mileage fleets, this translates into thousands of dollars per vehicle per year—often enough to offset incremental costs of premium engine oils or fuel‐saving technologies within a single season.

5. Return on Investment & Strategic Takeaways

  1. Investing in fuel‐economy lubricants (e.g., Codex SAE 15W-40 premium oils) can pay back in under 6 months.

  2. Telematics and driver training further compound gains by reducing idling and harsh driving.

  3. Regular maintenance (air filters, tire pressures) preserves peak efficiency over the vehicle life.

Bottom Line: Even modest improvements in fuel efficiency yield outsized reductions in TCO, improving fleet profitability and freeing capital for growth.

 

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