Japanese used trucks are famous for their durability and long engine life. However, proper maintenance plays a major role in this longevity. One of the most important maintenance tasks is choosing the right oils and lubricants. Whether you’re driving a Hino, Isuzu, Mitsubishi Fuso, or Nissan Diesel, using top-quality fluids ensures smooth operation, better fuel efficiency, and fewer breakdowns.
In this guide, we will explore the best engine oils, gearbox lubricants, and greases for Japanese trucks. We will also explain why global truck owners should pay close attention to the type and quality of fluids they use.
Why Lubrication Is Crucial for Japanese Trucks
Every engine part relies on clean oil and proper lubrication. Without the right oil, friction increases. This leads to overheating, part failure, and engine damage. Japanese trucks, known for their precision engineering, require consistent care. Using high-quality oils can extend the truck’s life and boost resale value.
Moreover, proper lubrication reduces repair costs. Many international buyers trust Japanese trucks because they perform well under heavy load and long-distance hauling. But that performance depends on proper maintenance.
Best Engine Oils for Japanese Diesel Trucks
Japanese diesel trucks often operate under harsh conditions. Therefore, the oil must handle high temperature, heavy load, and long driving hours.
Here are some recommended oils:
| Brand | Type | Viscosity | Recommended For |
|---|---|---|---|
| Shell Rotella | Synthetic Diesel Oil | 15W-40 | Long-haul Japanese trucks |
| Mobil Delvac | Advanced Synthetic | 10W-30 | Fuel economy and engine clean-up |
| Castrol Vecton | Heavy Duty Diesel | 15W-40 | High-load Mitsubishi Fuso, Hino |
| Eneos Premium | Japan-Made Oil | 10W-30 | Perfect for Isuzu ELF, Hino 300 |
Tip: Always follow the truck manufacturer’s oil specs. If unsure, consult the manual or a certified mechanic.
Gearbox and Differential Lubricants
While engine oil gets most of the attention, transmission and axle components also need protection. Japanese trucks often use manual gearboxes and heavy-duty differentials.
Here are top gear oils:
| Brand | Type | Use Area |
|---|---|---|
| Liqui Moly | GL-5 75W-90 | Differentials, axles |
| Toyota Gear Oil | GL-4 75W-85 | Manual transmissions |
| Valvoline | Full Synthetic | Long-distance applications |
Regular oil changes improve gear shift smoothness and fuel efficiency. In cold climates, lower viscosity (like 75W-80) helps.
Greases for Joints, Bearings, and Chassis
Many parts, including wheel bearings, chassis points, and universal joints, require grease. Here are popular options:
-
NLGI Grade 2 Lithium Grease – General chassis lubrication
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Molybdenum Grease – Excellent for high-pressure joints
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Multipurpose Synthetic Grease – For tropical or high-heat zones
Apply grease every 5,000 to 10,000 kilometers, especially in rough terrains or humid climates.
How Often Should You Change Oils and Lubricants?
| Component | Interval |
|---|---|
| Engine oil | Every 7,000 – 10,000 km |
| Transmission oil | Every 30,000 – 50,000 km |
| Differential oil | Every 40,000 km |
| Grease | Every 5,000 – 10,000 km |
However, if your truck is used in mountainous regions, dusty roads, or for heavy loads, more frequent changes are ideal.
Choosing Genuine vs. Generic Products
Always choose OEM-approved or trusted international brands. While cheaper oils may save money upfront, they can lead to engine sludge, gear wear, or seal damage.
Imported Japanese trucks deserve reliable fluids. After all, these trucks were built for performance, not compromise.
Final Thoughts: Protect Your Investment
Maintaining your Japanese truck with the right oils and lubricants is not just a routine task — it’s a smart investment. By keeping your truck’s systems clean and well-lubricated, you avoid costly repairs and extend vehicle life.
If you’re considering buying or already own a Japanese used truck, make sure you’re sourcing from experts. We recommend checking this guide:
👉 Top 5 Trusted Japanese Used Truck Exporters for Global Buyers
They provide not just quality vehicles, but also expert advice on how to care for them.