Diesel engines are the backbone of transport, agriculture, and backup power in Kenya. A Hino 700, Isuzu truck, or Powerstroke pickup costs KES 3–8 million. Spending an extra KES 50–100 per litre on the right oil seems trivial against a KES 1–2 million engine rebuild. Yet many operators stick with bargain oils that destroy engines within 2–3 years.

The difference: API certification and sulfur content.

Understanding Diesel Oil Grades

This section gives context and practical guidance so you can act on the recommendations with confidence.

API Performance Categories (In Order of Quality)

This section gives context and practical guidance so you can act on the recommendations with confidence.

API CH-4 (Phased out ~2002)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

API CI-4 (Still used for older engines)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

API CI-4 Plus

These points describe the key tradeoffs and how to use the information for better lubricant choices.

API CJ-4 (Current Standard — 2006+)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

API CK-4 (Latest Standard — 2017+)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Critical Differences: Why API Matters

This section gives context and practical guidance so you can act on the recommendations with confidence.

How to Know Which API You Need

This section gives context and practical guidance so you can act on the recommendations with confidence.

Check Your Truck's Manual (Primary method)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Check Your Engine/Manufacturer (If manual unavailable)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Rule of Thumb:

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Best Diesel Oils Available in Kenya (2026)

This section gives context and practical guidance so you can act on the recommendations with confidence.

Tier 1: CJ-4 Premium (Best Value)

This section gives context and practical guidance so you can act on the recommendations with confidence.

Shell Rimula R6 M 10W-40 ⭐ Best for Most Fleets

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Total Rubia TIR 8600 15W-40 ⭐ Budget-Friendly Alternative

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Mobil Delvac 1300 Super 15W-40

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Tier 2: CK-4 (New Trucks)

This section gives context and practical guidance so you can act on the recommendations with confidence.

Shell Rimula R6 LLA 10W-40

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Total Rubia Polytrafic LE 10W-40

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Fleet Economics: Choosing the Right Oil

This section gives context and practical guidance so you can act on the recommendations with confidence.

Fleet of 20 Trucks, 12,000 km/month average

Scenario A: Using CI-4 (Wrong for Modern Trucks)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Scenario B: Using CJ-4 (Correct for Most Modern Trucks)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Scenario C: Using CK-4 (Ideal for New Trucks)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Savings using CJ-4 vs CI-4: KES 5,928,000 over 3 years (on 20 trucks)

Savings using CK-4 vs CI-4: KES 5,712,000 over 3 years (on 20 trucks)

Common Diesel Oil Mistakes

This section gives context and practical guidance so you can act on the recommendations with confidence.

❌ Mistake 1: Mixing API Grades

These points describe the key tradeoffs and how to use the information for better lubricant choices.

❌ Mistake 2: Extending Drain Intervals Beyond Spec

These points describe the key tradeoffs and how to use the information for better lubricant choices.

❌ Mistake 3: Using Counterfeit Oils

These points describe the key tradeoffs and how to use the information for better lubricant choices.

❌ Mistake 4: Not Checking Oil Level

These points describe the key tradeoffs and how to use the information for better lubricant choices.

❌ Mistake 5: Using the Cheapest Oil

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Diesel Oil Maintenance Schedule

This section gives context and practical guidance so you can act on the recommendations with confidence.

Weekly:

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Every 1,000 km (or monthly, whichever comes first):

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Every Oil Change (8,000–10,000 km for CJ-4):

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Every 40,000 km:

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Every 80,000 km:

These points describe the key tradeoffs and how to use the information for better lubricant choices.

Bottom Line

This section gives context and practical guidance so you can act on the recommendations with confidence.

For trucks made 2007–2019: Use CJ-4 (Shell Rimula R6 M or Total Rubia TIR 8600)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

For trucks made 2017+: Use CK-4 (Shell Rimula R6 LLA or Total Rubia Polytrafic LE)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

For old trucks (pre-2007): Use CI-4 Plus (if engine still good)

These points describe the key tradeoffs and how to use the information for better lubricant choices.

At Crown Engine Oils Distributors, we stock full range of diesel oils from CI-4 to CK-4 at wholesale rates. Fleet operators get 10–15% discount on 500+ litre orders with same-day delivery. Get your fleet on the right oil today.