Buying a used truck: what to check before you commit

Most used-truck inspections start under the cab and end at the price. That order is wrong. A mechanically excellent tractor in the wrong regulatory class costs you money on every kilometre you run it, and no amount of workshop attention will fix that. Three things decide whether a used truck is a good buy: what it will cost per kilometre under the rules in force where you actually operate, whether it can legally do the work you have, and what the documents say about how it was used. The mechanical inspection is the fourth step, not the first.

Check the first registration date before the odometer

Since 1 December 2023 the German truck toll has charged by CO2 emission class. There are five classes, and the lower the emissions the better and cheaper the class. Toll Collect assigns every vehicle to class 1 by default and states plainly that vehicles first registered before 1 July 2019 are therefore correctly classified and, due to legal requirements, cannot be assigned to a higher CO2 emission class.

Read that again as a used buyer, because it is a hard ceiling and not an administrative one. A truck registered in June 2019 will sit in the most expensive toll class for the rest of its working life regardless of how clean it actually is.

The money involved is not marginal. Volvo’s figures for the German scheme put the rate for diesel trucks over 18 tonnes with five or more axles at 34.8 cents per kilometre, up from 19 cents. Across a year of international work that gap dwarfs most of what a haggle over the purchase price will achieve.

Where a truck is eligible to move up, the step can be small — Volvo notes that a 5 percent reduction in VECTO-calculated emissions can take a 4x2 diesel from class 1 to class 2 — but you have to prove it. Toll Collect reclassifies only against a vehicle registration certificate, the manufacturer’s customer information file (CIF), a certificate of conformity (CoC) or an individual authorisation. If none of those come with the truck, budget either for the time to obtain them or for class 1 rates. The same charging logic is spreading beyond Germany under the revised Eurovignette rules, with Poland, Belgium, Austria, Czechia, Hungary, Slovakia, Slovenia and Bulgaria following in 2024.

Euro VI is five standards, not one

Ask which step, in writing. Euro VI-D entered into force on 1 September 2018 for new types and applied to all new engines from 1 September 2019; Euro VI-E followed on 1 September 2020 for new types and 1 September 2021 for all new engines. Manufacturers publish different amounts of detail — MAN states Euro 6e for the TGX while DAF states only Euro 6 on its own specification sheets — so the registration document, not the brochure, is the arbiter.

Looking forward, Euro 7 (Regulation (EU) 2024/1257, in force 28 May 2024) applies to new heavy-duty types from 2028 and to all new heavy-duty vehicles from 2029. A Euro VI truck bought now therefore has a long and clearly defined runway ahead of it. A Euro V truck does not: it is already shut out of a widening list of urban access schemes and sits at the bottom of every toll table that differentiates.

The tachograph is a deadline you inherit

Under Regulation (EU) No 165/2014 as amended by the Mobility Package, vehicles first registered from 21 August 2023 carry smart tachograph version 2. Everything older had to be retrofitted on a published schedule: analogue and non-smart digital units by 31 December 2024, smart tachograph version 1 by 18 August 2025, and vehicles operating in a member state other than the one they are registered in by 19 August 2025. Light commercial vehicles between 2.5 and 3.5 tonnes in international transport or cabotage come into scope from 1 July 2026, and all drivers are to be on version 2 cards and vehicles by August 2028.

If the truck is destined for cross-border work and still carries version 1, that retrofit is your cost and your downtime. The unit itself is rarely the constraint; approved workshop capacity is. For purely domestic work the pressure is lower, but it narrows the pool of buyers you can resell to later.

While you are there, ask for the last tachograph inspection report. Article 23 of the same regulation requires inspection by an approved workshop at least every two years, and the report both tells you when the next one falls due and occasionally tells you something about the seals.

Read the roadworthiness file as a mileage record

Directive 2014/45/EU sets the test interval: heavy goods vehicles in categories N2 and N3, and heavy trailers in O3 and O4, are tested one year after first registration and yearly thereafter. Mileage is recorded on the certificate, and data from the preceding test is made available to the inspector specifically so that odometer fraud can be detected.

That makes the file more useful than the pass. Four consecutive certificates with a smooth, plausible mileage curve describe a truck. The same odometer reading with one certificate and a two-year gap describes a question. A reading that moves backwards, or an annual increment that does not match the duty the seller is describing, is a finding you can act on before the vehicle ever goes on a ramp.

Buying across a border, it is worth knowing that a certificate issued in another member state must be recognised on re-registration, even where ownership has changed. That removes the most common excuse for a file that is not there.

Duty cycle beats odometer

Half a million kilometres of steady motorway running at 40 tonnes and half a million kilometres of stop-start regional distribution produce two very different vehicles with identical dashboards. Ask for telematics or tachograph summaries and look at three numbers: average speed, share of engine hours at idle, and share of distance on motorway. Those predict the next 300,000 kilometres far better than the total does.

Ask what it pulled and where, too. A tractor that has worked Alpine routes at maximum combination weight has had a different career from a flatland trunker with the same reading, and the gap shows up in running costs rather than in the advert.

Specification against your work, not the seller’s

Axle configuration is where the expensive mistakes live. A 4x2 is the cheapest tractor to run and the right answer for anything that stays on made roads at normal weights. The 6x2 family adds an axle for payload or to meet statutory axle loads. A 6x4 drives both rear axles for traction and heavy combinations, and charges you weight and fuel on every day you do not need it — buying one for occasional site access is a common purchase that rarely repays itself.

Plated ratings follow components, not model names. On the Volvo FH the permitted combination weight tracks the I-Shift variant fitted as much as the vehicle. On the Scania S-series it follows the rear axle, and a single-reduction axle, a hub-reduction axle and a tandem hub-reduction group are rated very differently indeed. Read the plate, then read the gearbox designation.

The cab decides who will drive it. On long-haul work, a truck a driver will not sleep in is a truck that stands in the yard, which is why the large flat-floor cabs hold their value better than the specification sheet alone would suggest.

The document list

Before money moves, have all of these in hand: the registration certificate with the VIN matching both the chassis plate and the frame; consecutive roadworthiness certificates with their mileage readings; a service record carrying dates and mileages rather than stamps alone; the CoC or the manufacturer’s customer information file for the CO2 class; the last tachograph inspection report with the next date due; an ADR certificate if the work needs one; and the accident and cab repair history.

When to walk away

Broken roadworthiness continuity with no explanation. A first registration before July 2019 for an operation that lives on German motorways. An emissions and aftertreatment history with gaps around expensive dates. A specification that only ever made sense for the seller’s work rather than yours.

Any one of those is a negotiating position. Two of them together usually means the truck is cheap for a reason somebody else has already found.