Recommissioning a car that has sat: the first-month list

A car that has sat does not need "a service". It needs a defined list of work, most of it on systems that degrade whether the car is driven or not, and the list is largely the same regardless of make. Knowing it in advance is the difference between a budgeted first month and a series of unwelcome discoveries.

This page is the list, in the order a competent shop would do it.

It deliberately does not give prices. Parts and labour for this work vary by marque, by era and by where you live, by multiples rather than percentages — a brake rebuild on a common American V8 and on a 1960s Italian car are not the same job at all. Anyone quoting you a single national figure for "recommissioning" is guessing. Take this list to a shop that knows the marque and have them price these items for this car. That quote is worth having before you bid, not after.

For what causes all of this, see what sitting does to a car.

Before it moves under its own power

Resist starting it. A car that has sat for years can be damaged by being started badly, and the first turn of the key is the one chance you get to do it deliberately.

1. Look underneath and at the ground. Fresh drips, and dried trails that show where it leaked while parked. Note every one; you are building the list.
2. Fluid levels and condition. Oil that is milky or smells of fuel, coolant that is brown, brake fluid that is dark. Each of those changes what happens next.
3. Turn the engine by hand at the crank bolt, through two full revolutions, before any attempt to crank it on the starter. An engine that will not turn by hand must not be turned by the starter.
4. Rodent survey. Air box, under the carpets, above the fuel tank, along the loom, inside the heater box. Nests are a fire risk and chewed insulation is an electrical fault waiting for a load.
5. Tyres. Date codes on the sidewall. Rubber over roughly six years old is replaced on condition regardless of tread depth, and flat spots and sidewall cracking settle it.

The list that is not optional

These are the items that come up on nearly every long-stored car, and each one is a safety or reliability item rather than a preference.

Fuel system, end to end. Old petrol goes from stale to varnish to solid. Expect: drain and dispose of the tank contents, inspect the tank internally and clean or replace it, replace the fuel lines and filter, and rebuild or clean the carburettors or injectors. Carburettors corrode internally after around three years standing, so on anything with a long layup assume a rebuild rather than hoping.

Brake hydraulics. Brake fluid is hygroscopic; it absorbs water and the water corrodes the system from inside. Expect a full flush, and on a long layup expect master cylinder, wheel cylinders or calipers, flexible hoses and often the rigid lines. Seized calipers and cylinders are the norm, not the exception. Do not shortcut this one.

Clutch hydraulics, for the same reason, where fitted.

All rubber. Not just tyres: brake hoses, fuel hoses, coolant hoses, vacuum lines, suspension bushes, engine and transmission mounts, and every seal the car has. Rubber ages on the shelf; standing still does not preserve it.

Battery. Almost always replaced. A battery left flat for years is not worth recovering.

All fluids and filters. Engine oil and filter, coolant, gearbox, differential, power steering, air filter. Change rather than top up — you want a known baseline and you want to see what comes out.

Timing belt, where fitted. Age-expired regardless of mileage, and on an interference engine a failure is an engine. If its age is unknown, it is due.

Cooling system. Radiator and heater core blockage and corrosion, thermostat, water pump. A car that ran fine twenty years ago will overheat now if the system silted up while parked.

Exhaust. Rots from the inside with condensation when the car is not driven hot. Often serviceable, frequently not.

Then, and only then

Get it running, get it stopping, and get it inspected or MOT'd rather than road-testing it yourself. Use the failure sheet as a prioritised list — it is the cheapest competent second opinion you will get, and it is written by someone with no stake in the sale.

Drive it, then check it again. Heat, expansion, vibration and load expose things that a stationary car hides. Leaks appear, bearings get noisy, and the second inspection after the first hundred miles finds what the first one could not. Budget a return visit; it is part of the job, not a sign the job was done badly.

What this means when you are buying

"Barn find", "stored for twenty years" and "running when parked" are descriptions of a maintenance backlog. The backlog is predictable, which is good news — you can price it before you commit, and a shop that knows the marque can quote this list from the photographs and the story.

Two consequences for the purchase itself:

This cost lands in month one, not someday, and it is routinely a four-figure sum on an otherwise sound car. It belongs in your bid ceiling at full value, not discounted for optimism.

Low mileage since restoration is not automatically good. A car that was restored and then stood for fifteen years needs most of this list too. Mileage tells you about wear; it tells you nothing about age.