An annual boat engine service costs between €130 and €250 for a small outboard, €350 to €650 for a 70 to 150 hp outboard and €350 to €750 for a sailboat's inboard diesel. Large motorboat diesels and petrol sterndrives climb to €500 – 1,300 per engine. If your boat has twin engines, budget for two services.
These are indicative ranges in euros, VAT included, built from rates published in 2025 and 2026 by workshops and marinas in Mediterranean Europe (Spain and France), with the UK as a comparison. In other regions, and depending on the port and season, prices can be quite different.
Boat engine service cost in 2026: summary
The table above groups engines by type and power, because those are the two things that move the bill most. The hours column shows the workshop time usually charged for a standard service with good engine access. The price column adds those hours, the oils and the filters. Wear parts such as the impeller, spark plugs, belt or anodes are added when they are due, and can add €50 to €250 depending on the engine.
Some real reference points behind the ranges:
- A French workshop publishes 2026 fixed prices for four-stroke outboard services, including oils and filters, of €160 for 2 to 8 hp, €245 for 30 to 40 hp, €320 for 80 to 115 hp and €450 for 250 to 300 hp, VAT included. Impeller, belts, plugs, thermostats and anodes are extra, and additional labour costs €70 an hour.
- A UK workshop charges £109 to £256 plus VAT for a full four-stroke outboard service depending on power, parts extra, with labour at £55 plus VAT an hour.
- A service kit for a Volvo Penta D2-40, the typical engine on a 10 to 12 m sailboat, with oil filter, fuel filter, impeller and 10 litres of oil, costs around £105 to £127, or roughly €125 to €150.
What the service price includes
A proper annual service is more than an oil change. This is what should appear on the quote:
- Engine oil and oil filter. An outboard takes 1 to 8 litres, an inboard diesel 3 to 20 litres depending on size.
- Gearcase or gearbox oil. On outboards and sterndrives the lower unit oil is drained and checked for a milky colour, which means water. On inboards the gearbox oil is checked or changed.
- Fuel filters. Both the engine filter and the water-separating pre-filter, which is critical on a diesel.
- Raw-water pump impeller. Inspected every year and replaced every one or two seasons.
- Sacrificial anodes. Checked on the drive leg, shaft, saildrive or heat exchanger, and replaced once half worn.
- Belts, hoses and clamps. Checked for tension and cracks.
- Spark plugs on petrol engines and the air filter where fitted.
- Greasing of steering, shafts, propeller splines and drive leg points.
- Electronic diagnostics on engines with an ECU, reading hours and fault codes.
- Test run on the water or with flushing muffs to check temperature, cooling flow and alarms.
Usually billed separately: the mechanic's travel if the boat is in another port, waste disposal (used oil and filters, sometimes 1 to 2 % of the invoice) and, if the job needs the boat out of the water, the haul-out.
Factors that change the price
Engine type and power
A small outboard can be serviced in an hour on the workshop stand. A 300 hp diesel in a cramped engine room can take a full day. More power means more oil, pricier filters and more points to check. Petrol sterndrives such as MerCruiser or Volvo Penta add the upkeep of the drive and, every few years, new bellows, which is an expensive job. As a reference outside Europe, an Australian workshop lists labour alone for an annual sterndrive service at AUD 795 to 1,095 including tax, depending on engine size and drive type.
Access
This is the factor that surprises owners most. Two sailboats with the same engine can get very different bills if on one the impeller is reachable in five minutes and on the other the companionway steps, alternator or pump have to come off. That is why many workshops won't give a fixed price without seeing the boat. Always ask whether the quote is a fixed price or billed on actual hours.
Single or twin engines
Boats with twin outboards or twin inboards pay almost double. Some workshops knock a little off the second engine because travel and setup are shared, but the parts are the same.
Engine condition and hours
An engine that has been serviced on schedule is quick to do. One that has gone two or three years untouched usually hides seized bolts, exhausted anodes, scaled-up cooling circuits or filters that won't come off. All of that is extra hours.
Authorised dealer or independent workshop
Authorised dealers charge more per hour, but they have the manufacturer's diagnostic tools and keep the warranty valid. A reputable independent is usually cheaper once the warranty is over. In the rates we checked, labour ranges from about €45 plus VAT for a skilled mechanic at a boatyard in Castellón to €77 including VAT for general mechanical work and €100 including VAT for specialist work at a Costa del Sol marina.
Season and location
In spring every owner wants the boat ready at the same time and workshops are fully booked. Servicing in autumn or winter, often together with winterisation, gives you more flexibility and sometimes a better price. In the most expensive tourist ports the hourly rate is higher too.
Real example: 10 m sailboat with a Volvo Penta D2-40
A 10 m cruising sailboat with a 40 hp diesel and saildrive, in a Mediterranean port, with reasonable engine access. Indicative quote including VAT:
- Labour, 4 h at €60/h: €240
- Filter kit (oil, fuel, pre-filter) and impeller: €70 – 90
- Engine oil, about 7 litres, plus saildrive oil: €60 – 80
- Saildrive anode: €30 – 50
- Alternator belt, if due: €25 – 40
- Coolant, every two or three years: €20 – 30
- Waste and consumables: €10 – 15
Total: €455 to €545, without haul-out. If the saildrive anode or seal requires lifting the boat, add the haul-out, although it makes sense to combine it with the antifouling haul-out.
For comparison, a 115 hp outboard on a 6 m RIB would come to about €350 – 450: a €320 fixed-price service with oils and filters, plus a set of plugs and, every other year, the impeller.
DIY or hire a professional
Changing the oil and filters on a small outboard or a sailboat diesel with good access is well within reach of a handy owner. You save the labour, which is half the bill, and you get to know your engine. Service kits are sold by engine model and contain all the basics.
It makes sense to hire a professional when:
- The engine is under warranty. A service without a dealer invoice can cost you the cover.
- The engine has an ECU. Diagnostics and resetting service alerts need the manufacturer's software.
- The job is delicate. Impellers on hard-to-reach engines, sterndrive legs and bellows are easy to damage without experience.
- You have nowhere to dispose of waste. Used oil and filters must go to a recycling point or the marina's collection bins, never into the water.
- You are selling the boat. A service history stamped by a workshop is worth money.
A middle way is to do mid-season oil changes yourself and leave the full service to a workshop once a year.
How to save without cutting corners
- Service in autumn or winter. Workshops have more capacity and you can combine it with winterisation.
- Ask for a fixed price. A price by horsepower with the inclusions in writing avoids surprise hours.
- Supply the kit yourself, if the workshop accepts it, bought by exact part number. Ask first: some won't warranty parts they didn't supply.
- Bundle jobs. If you're hauling out for antifouling, change the anodes and check the propeller and saildrive at the same time, and you save a haul-out.
- Flush the engine with fresh water after every trip and run it every few weeks. Less corrosion, fewer workshop hours.
- Keep your invoices. They stop the mechanic replacing things that were changed last year.
- Don't skip the impeller. It's a cheap part, and skimping on it is the most common way to end up paying for a cylinder head.
How to choose a professional
Before handing your engine over, ask and compare:
- Are they an authorised dealer for your brand? If the engine is under warranty, this is almost essential.
- Is the price fixed or hourly? Ask for a breakdown: oils, filters, impeller, anodes, diagnostics and test run.
- What is the hourly rate and the call-out charge? Some bill the trip to the marina as an extra hour.
- Which parts do they use? Genuine or quality equivalents, with part numbers on the invoice.
- What warranty do they give on the work?
Compare at least two or three quotes for the same scope. Red flags are a price far below the rest with no breakdown, not asking for the engine model and hours, or refusing to give an invoice. On Nautify you can find marine mechanics in Mallorca or boat maintenance workshops in Barcelona, read their reviews and request quotes from several. To understand what the mechanic checks, see our guides to inboard diesel engine maintenance and outboard engine maintenance.
Conclusion
For most leisure boats, the annual engine service costs €300 to €700 per engine, and it is the best money you will spend on maintenance. Budget for it every year, do it out of season if you can and insist on a clear breakdown of what is replaced. If you need a mechanic you can trust, Nautify lets you compare professionals in your area.
