Sisu SM300 CKH-6X2
Built: 1983-1990 · Series: SM300
More machines from model year 1983
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The Sisu SM300 CKH-6X2 was built from 1983 to 1990 and is thus among the older vehicles of the Finnish maker in the dataset. The model designation SM300 refers to the heavy class in which Sisu then offered trucks for Nordic long-haul traffic and the timber industry. The code 6X2 describes six wheel positions with two driven, a three-axle tractor with only one drive axle.
The engine delivers 298 kW from 14,000 cm³ displacement. That is a very large displacement, typical of the time, when makers still gained power mainly through volume rather than heavy turbocharging. At 11,100 mm long and 2,700 mm wide the vehicle is large, and the kerb weight is 10,400 kg.
The long production period of seven years speaks for a mature concept. The vehicle is an example of trucks from the time before today's emission stages, in which cab, frame and drivetrain were still kept simple and sturdy.
Sisu SM300: Finnish heavy-duty lorry with a six-cylinder engine, 14,000 cc displacement, 298 kW output, a 13-speed gearbox and a length of 11,150 mm, built in 1984
Sisu is a Finnish manufacturer of heavy lorries and special vehicles whose chassis have long been built for Nordic long-haul transport and for military use. The SM300 stands in this register as a model of its own from 1984.
Read on 3 more paragraphs
The SM300 is driven by a six-cylinder engine of 14,000 cc displacement producing 298 kW. Power runs through a 13-speed gearbox, geared finely enough to cope with both long-haul cruising and pulling away loaded on a gradient. At a length of 11,150 mm and a width of 2,680 mm, the vehicle weighs 10,400 kg empty.
The kerb weight of 10,400 kg alone shows that, once bodywork and load are added, the SM300 belongs to the heavy N3 class above 12 t gross vehicle weight, for which a top speed of 90 km/h applies across the EU. The large displacement combined with moderate specific output is typical of engines built for durability on long hauls rather than for high revs, and it suits a chassis of this length, intended for a tractor-trailer or flatbed body.
Buying a Sisu of this era, it pays to check the clutch plates and the synchro rings inside the 13-speed gearbox, since both wear under intensive long-haul use. The six-cylinder engine with its 14-litre displacement warrants a look at the cooling system and turbocharger, and on a vehicle from the 1980s, frame corrosion under the cab is a common weak point worth checking before purchase.
Sources: SpecCodex-Register: Kennwerte des Modells SM300, Sisu (manufacturer)
Technical data
Engine
| Power | 298 kWcorrect |
|---|---|
| Displacement | 14,000 cm³correct |
Dimensions and weights
| Length | 11,100 mmcorrect |
|---|---|
| Width | 2,700 mmcorrect |
| Unladen weight | 10,400 kgcorrect |
Where this model stands
Power-to-weight ratio: 28.7 kW/t (298 kW / 10.4 t)
Stronger than 54% of the trucks in the register — out of 25,242 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Sisu SM300 CKH-6X2 have?
The Sisu SM300 CKH-6X2 delivers 298 kW.
How much does the Sisu SM300 CKH-6X2 weigh?
The unladen weight is 10,400 kg.
What engine does the Sisu SM300 CKH-6X2 have?
14,000 cm³ displacement.
What are the dimensions of the Sisu SM300 CKH-6X2?
11,100 mm × 2,700 mm.
When was the Sisu SM300 CKH-6X2 built?
Production years: 1983-1990.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 6 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
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Other models in this series
Sources: Traficom — Finnish vehicle register (retrieved August 2026) · speccodex.com (retrieved October 2026) · How we check the data
Truck in 3D section
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