Fuso Super Great Engine Guide | 6R30, 6R20, 6R10, 6M70

The Mitsubishi Fuso Super Great has used very different heavy-duty diesel engines across its generations, so choosing a used truck by the “Super Great” name alone is not enough. Earlier trucks can be found with large V8 engines, the 2000s brought the 6M70 inline-six, later used trucks commonly feature the 12.8-liter 6R10, the 2017 generation introduced the smaller 10.7-liter 6R20 and 7.7-liter 6S10, and the current Japanese Super Great uses the 12.8-liter 6R30.

For an overseas buyer, there is no single engine that is automatically best for every country or job. The correct choice depends on the actual engine specification, model code, GVW, body, transmission, operating condition, emissions equipment and local service support. This guide explains the major Super Great engine generations and what to check before buying one from Japan.

Fuso Super Great Engine Evolution at a Glance

This timeline is a buyer reference rather than a complete production matrix. Mitsubishi Fuso offered different engine outputs, chassis, axle layouts and applications within the same period. Always identify the actual truck by its full model code, chassis number and engine model.

6R30: Current 12.8L Super Great Engine

Mitsubishi Fuso introduced the 6R30 with the 2023 full model change of the Super Great. The manufacturer identifies it as a 12.8-liter inline-six intercooled turbo diesel developed for strong low-speed torque and improved fuel efficiency.

Current Japanese-market rigid-truck specifications include:

Mitsubishi Fuso also uses ShiftPilot automated manual transmission technology with the current Super Great. The powertrain is calibrated to make greater use of the engine's lower-rpm operating range.

What Overseas Buyers Should Check on a 6R30 Truck

The 6R30 represents the newest Super Great technology, but that also means buyers should consider service capability at the destination.

• Electronic diagnostic support
• Aftertreatment-system servicing
• AdBlue availability
• Sensor and electrical parts support
• Transmission diagnostic capability
• Correct filters and service parts

Do not choose the newest engine simply because it has the newest specification. Confirm that the truck can be maintained properly where it will operate.

6R20: The 10.7L Engine Introduced in 2017

The 2017 Super Great represented a major powertrain change. Mitsubishi Fuso introduced the 10.7-liter 6R20 alongside the 7.7-liter 6S10.

The manufacturer stated that the 6R20 was approximately 170kg lighter than the previous 12.8-liter engine while delivering strong low-speed torque.

For used-truck buyers, this generation is particularly interesting because it combines a smaller-displacement engine with a modern heavy-duty powertrain and the 12-speed ShiftPilot AMT.

6R20 Specifications

Output depends on the vehicle and engine specification. Mitsubishi Fuso documentation for Super Great tractor applications has listed:

These figures describe specific Mitsubishi Fuso specifications and should not be applied automatically to every used 6R20 truck.

6S10: 7.7L Engine for Applicable Super Great Specifications

The 6S10 was introduced with the 2017 Super Great as a 7.7-liter inline-six diesel.

Mitsubishi Fuso tractor specifications list the 6S10 (T2) at 280kW / 381PS and 1,400Nm.

A smaller displacement does not automatically mean that the truck will use less fuel in every operation. Actual consumption depends on GVW, load, body, transmission, route, gradients, traffic and driving conditions.

6R10: A Major Engine in the Japanese Used Super Great Market

The 6R10 is one of the most relevant engine codes for overseas buyers searching used Super Great trucks from the 2010s.

Japanese used stock includes 6R10-equipped dump trucks, flatbeds, tractor heads, wing bodies and other heavy-duty configurations.

The 6R10 is a 12.8-liter inline-six diesel family, but output differs by engine specification.

Previous Mitsubishi Fuso documentation includes several 6R10 versions for heavy-duty and tractor applications, including 420PS, 460PS and 520PS specifications.

This makes one point especially important:

Do not advertise or order parts for a used truck based only on “6R10.” Confirm the complete engine and vehicle specification.

Used 6R10 Buying Checks

• Full model code
• Chassis number
• Engine identification
• Actual output specification
• Transmission
• DPF / SCR system condition
• AdBlue system
• Cooling system
• Turbocharger condition
• Diagnostic trouble codes where available

6M70: An Important 2000s Super Great Engine

Mitsubishi Fuso's official history identifies the introduction of the 6M70 in 2000 as an important stage in the Super Great's development.

During this period, the heavy-duty powertrain was moving away from large V8 engines toward inline-six turbocharged engines. By 2005, Mitsubishi Fuso states that the Super Great lineup had standardized on inline-six turbo engines in response to emissions requirements.

The 6M70 therefore represents an important generation for overseas used-truck buyers.

Current EVERYCAR.jp used Super Great inventory continues to include 6M70-equipped vehicles, including flatbeds and tractor-related specifications.

Why Buyers Still Search for the 6M70

Many overseas buyers search for 6M70 trucks because they already operate similar Mitsubishi Fuso heavy-duty vehicles or have established parts and workshop support for that engine family.

That existing support can be more useful than a general claim that one engine is “more durable” than another.

Before purchasing an older 6M70 Super Great, check:

• Cold-start behavior
• Engine blow-by
• Exhaust smoke
• Oil and coolant leakage
• Cooling-system condition
• Turbocharger condition
• Transmission and clutch where applicable
• Differential and driveline noise
• Chassis corrosion and previous repair

What About 6D40 and Older V8 Super Great Engines?

The original article compared the 6D40 directly with the 6M70 and 6R10 and described it as the easiest engine to maintain globally.

That comparison is too broad for a buyer guide.

Older Mitsubishi Fuso heavy-duty trucks can use large-displacement engine families including V8 configurations, and older Japanese Super Great stock still exists with engine capacities around 17.7L, 20L and 21.2L depending on the truck.

However, age, exact engine model and destination-country parts support matter more than a general statement that an older engine is easier to repair.

For an older truck, confirm the engine code first and ask your local parts supplier whether routine and major repair components are actually available.

Super Great Engine Comparison for Used-Truck Buyers

Which Super Great Engine Should You Choose?

There is no technically sound reason to rank the engines as “6R10 for fuel economy, 6M70 for durability and 6D40 for maintenance” without comparing the actual trucks.

A better selection method is to start with the job.

Do Not Compare Engines by Horsepower Alone

Horsepower is only one part of a heavy-truck powertrain.

For commercial operation, buyers should also compare:

• Maximum torque
• Torque rpm
• Transmission
• Final-drive gearing
• GVW / GCW
• Axle configuration
• Body weight
• Actual operating load
• Route and gradient

A higher-output tractor specification is not automatically the correct engine for a rigid cargo truck or dump truck.

Fuel Economy: Avoid Generic km/L Claims

The original article describes the 6R10 as the fuel-efficiency leader, but no single engine-wide km/L figure can support that conclusion for every Super Great.

Fuel consumption varies with:

• Vehicle configuration
• GVW and actual payload
• Trailer weight
• Body type
• Transmission
• Axle ratio
• Route and gradients
• Traffic
• Tyres
• Driver operation
• Mechanical condition

Official fuel-economy figures also apply to specific chassis and defined Japanese test conditions. They should not be presented as the expected real-world consumption of every truck using the same engine.

Compare the complete vehicle specification and operating conditions instead.

Parts Availability: Check Your Destination Before Buying

Do not assume that an engine is easy to maintain worldwide simply because it is older.

Before buying, send your local Fuso parts supplier or workshop:

• Full model code
• Chassis number
• Engine model
• Registration / production period
• Transmission model where available

Ask specifically about filters, belts, cooling-system parts, clutch components, turbocharger parts, injectors, sensors, transmission parts and emissions-system components where applicable.

If your fleet already operates 6M70 or 6R10 trucks, existing workshop knowledge and parts stock may influence the most practical purchase.

Used Super Great Inspection Checklist

1. Verify the Engine and Model Code

Confirm the complete model code, chassis number and engine model from the actual vehicle documentation. Do not rely only on the listing title.

2. Request a Cold-Start Video

Check starting behavior, smoke, abnormal noise, warning lamps and visible leakage before the engine reaches operating temperature.

3. Inspect the Cooling System

Heavy-duty trucks can spend long periods under high load. Check the radiator, coolant reservoir, hoses and evidence of previous overheating.

4. Inspect the Chassis

Check frame rails, crossmembers, suspension mounts and body/subframe mounting areas for corrosion, cracks, deformation and previous repair.

5. Test the Transmission

Super Great trucks can have different manual and automated transmission specifications depending on generation. Verify the actual transmission and test its operation.

6. Check Emissions Equipment

On applicable later trucks, inspect DPF/SCR-related warnings, AdBlue system condition and diagnostic information.

7. Test the Commercial Body

A mechanically sound chassis can still require expensive body repairs. Test the dump, wing, crane, power gate, mixer or other equipment separately.

Model Code and Body Matter as Much as Engine Model

Japanese used Super Great inventory includes many chassis families such as FP, FS, FU, FV and FY-related model codes.

Current EVERYCAR.jp inventory demonstrates how different the trucks can be even within one model name. Available examples include flatbeds, dump trucks, wing bodies, tractor heads, self-loaders, freezer trucks and other configurations.

Therefore, record the following before comparing two Super Great trucks:

• Full model code
• Chassis number
• Engine model
• Maximum payload
• Vehicle weight
• GVW
• Overall dimensions
• Transmission
• Axle / drive configuration
• Body type

Shipping a Super Great from Japan

Heavy-duty trucks require vehicle-specific shipping calculations.

Before purchase, confirm:

• Overall length
• Overall width
• Overall height
• Vehicle weight
• Body configuration
• Special equipment or projections
• Available shipping method
• Destination-country import eligibility

A tractor head and a high-roof wing body can have very different freight requirements even when both are Mitsubishi Fuso Super Great trucks.

Import age limits, inspections, emissions requirements, taxes and registration rules vary by destination and may change. Check the current official requirements for the destination country before purchasing.

Five Questions to Ask Before Buying a Super Great

1. What are the complete model code, chassis number and engine model?
2. What are the registered GVW, maximum payload and overall dimensions?
3. Can you provide a cold-start video and detailed chassis photographs?
4. What transmission and emissions equipment does the truck have?
5. Can the body or PTO-driven equipment be demonstrated before shipment?

FAQ: Fuso Super Great Engine Models

What engine does the current Japanese Fuso Super Great use?

The current Japanese-market Super Great uses the 12.8-liter 6R30 inline-six turbo diesel. Current rigid-truck specifications include 394PS and 421PS versions.

What is the difference between 6R10 and 6R20?

The 6R10 is a 12.8-liter engine found in many earlier used Super Great trucks, while the 6R20 is a 10.7-liter engine introduced with the 2017 generation. Exact output varies by specification, so compare the actual model code, engine variant, transmission and vehicle application.

Is the 6M70 still worth considering?

A well-maintained 6M70 truck can still be relevant for an overseas buyer, particularly where local workshops and parts suppliers already support the engine family. Condition and parts availability should be checked before purchase rather than assuming reliability from the engine name.

Is the 6R10 always more fuel-efficient than the 6M70?

No universal comparison can be made from the engine code alone. Fuel consumption depends on the complete truck specification, load, transmission, route, tyres, condition and driving operation.

Should I choose the engine with the highest horsepower?

Not necessarily. Match engine output and torque to GVW or GCW, body, transmission, axle configuration, route and intended work. Higher horsepower can be unnecessary for some applications.

Find a Used Mitsubishi Fuso Super Great from Japan

EVERY TRADING has exported Japanese used vehicles and commercial equipment to customers in more than 100 countries since 2006. When selecting a Super Great, compare the actual engine model, chassis, GVW, body, transmission and condition instead of relying on a simple engine ranking.

View Available Mitsubishi Fuso Super Great Stock

If the engine, model code or body specification you need is not currently available, Japanese vehicle auctions can provide additional sourcing opportunities.

Search Super Great Trucks at Japanese Auctions

Related Fuso Super Great Guides

• Japanese Used Truck Guide – 100 Articles
• Fuso Super Great: Reliability in Heavy Transport
• Fuso Super Great Tractor Head Guide
• Fuso Super Great Special-Purpose Truck Guide

Mitsubishi Fuso Super Great engine output, transmission, emissions equipment and vehicle specifications vary by production date, model code and chassis. Current 6R30 specifications and historical 6R20, 6R10 or other engine figures should not be applied automatically to every used vehicle. Always verify the actual Japanese vehicle documents, chassis number and engine model before purchase. Destination-country import and registration requirements should also be confirmed before shipment.