What a service includes — and how to read the quote

The only binding document is the manufacturer's maintenance schedule for this exact vehicle — by engine code, transmission type and build date. It assigns a list of operations to each interval, and those lists differ between two engines from the same family. What a workshop calls a “minor service” or “major service” is a sales name laid on top of that schedule.

On top of that, many cars no longer prescribe a fixed interval at all but calculate one. The control unit weighs driving profile, cold starts, oil quality and time, and announces the appointment when it is due. A workshop that ignores that value and plans by odometer reading is working past the specification — in both directions.

So the first question on the phone is not “what does a service cost?” but “which items does the maintenance schedule specify for this vehicle at this point?”. The second question is the same one, asked of the second workshop. Only then do you compare numbers.

Engine oil and oil filter are the core, and the oil is not just any oil. Every manufacturer names an approval — a code standing for viscosity and for a set of properties, for instance ash content on cars with a particulate filter. The wrong approval is not a cosmetic error: on an engine with a wet timing belt an unsuitable oil attacks the belt material, and on a particulate filter too much ash fills the filter faster.

Then come the filters due under the schedule — air filter, cabin filter, on a diesel the fuel filter — topping up of fluids, and a visual inspection whose result is recorded in writing. “Checked”, with no finding, is not information; “front brake pads measured, remaining thickness noted” is.

The items that get argued over at the end are nearly always the same, and as a rule they are not part of the base scope: brake fluid, which falls due by time rather than distance because it draws water from the air and loses its boiling point; automatic transmission oil, which appears in many schedules not at all and which the maker often lists as a lifetime fill; coolant; spark plugs on a petrol engine.

Wear items are not included either. Brake pads and discs, wiper blades, the battery, the tyres — they get measured and assessed, but replacing them is a separate line with its own price. A quote that names the service and stays silent on the brakes is not dishonest; it simply answers a different question from the one you asked.

The third block is work that is technically sensible but not prescribed: an air-conditioning service, cleaning the brakes before winter, cavity protection. These are legitimate offers. They simply belong shown separately from the mandatory scope, so you can accept or decline each one on its own.

A quote consists of labour, parts and surcharges. Labour is the hourly rate times the time booked — and that time is as a rule not stopwatch time but a standard time from a catalogue maintained by manufacturers and data providers. That is why two workshops with the same hourly rate can name different amounts: they book different times, or one charges two overlapping jobs twice instead of once.

Parts should ideally be listed individually with number and description. That is how you see the quality tier: an original part in the maker's box, the same part from the same supplier in the supplier's own box, or a part from a third manufacturer. All three can be right. But comparing two quotes without that detail is comparing two numbers, not two offers.

Then the surcharges that get overlooked: consumables, usually as a share of the labour, disposal of waste oil and old parts, diagnostic time, and finally whether the total is shown net or gross. Laying a net quote beside a gross one is the most common arithmetic error in a comparison.

Four questions make any quote comparable, and none of them turns you into a difficult customer. A workshop unwilling to answer them has answered you in its own way.

How strongly a written estimate binds is governed by the law of the country where the contract is concluded, and it turns on which word is on the paper — estimate, quotation, appraisal and fixed price are not the same thing. If you want to rely on it, do not have the legal position explained to you; have it written down.

In practice three sentences in the order confirmation do the work: a ceiling, a duty to consult before exceeding it, and a rule that additional work is authorised before it is carried out. With those three sentences the legal question is largely defused, because you are relying on the contract rather than on a statute.

And the old request that is still the best test: ask for the removed parts back before the work begins. It costs nothing, it is customary, and it answers the question of whether an item was actually carried out without anyone having to be distrusted.

Do not lay the two quotes side by side; lay them on top of each other. Write the items from one into a column and find the counterpart in the other. What stays empty in a column is the real difference — usually a filter, a fluid on a time interval, or diagnostic time that one workshop shows separately and the other folds into the labour.

The hourly rate alone carries little. A higher rate with a leaner booked time and a part that does not have to be fitted twice can come out below the lower rate. Conversely, a very low number is sometimes the offer that leaves out half the list — which you notice only when the same items turn up on another quote three months later.

The invoice is not the end of the transaction but the asset it leaves behind. It should name the date, the mileage, the parts with their numbers, the oil approval and each operation separately. A stamp without an invoice loses noticeable weight at resale — not because a stamp is worthless, but because a buyer wants to check what stands behind it.

And the question to ask while paying, because at that moment it costs nothing: what falls due at the next appointment, and the one after? Write the answer down and you turn the unpleasant surprise into an item you can plan for and compare quotes on in good time. That is exactly the difference between running costs and a bill that arrives.