Buying a used car from a private seller: the checks that stop a cheap car costing you more

The best tool for buying a used car is a bit of suspicion. Not the rude kind, just the healthy sort that asks why this one sits a few thousand under every other car of its age. A private sale comes as is, and once the money changes hands, the faults are yours. The money you save on the price is the work you do on the checks, so do them properly.

Why a private sale puts the work on you

A dealer has a name to protect and rules that make them stand behind the sale. A private seller has a car and a reason to move it on. Most are genuine people, so treat this as a fact about where the responsibility sits, not a warning. No dealer warranty, no lot to drive back to, and sold as is means the checking is your job.

Buying a used car privately in Australia is common, and it goes smoothly when you work down a used car checklist before you pay.

Start with the paperwork, not the paintwork

Shiny paint hides a lot. Paperwork hides nothing, so it comes first. Ask for the rego papers before you look at the car, and match the VIN and engine number against the papers and the seller’s name.

Do a PPSR check before buying a car, not after you hand over the cash. It costs a small fee, takes a few minutes online and tells you whether the car has money owing on it or is recorded as stolen or written off. Check the rego status too, through your state or territory transport agency. If the seller will not show the papers first, that is your answer, whatever the price.

The outside: what the panels tell you

Once the paperwork is clean, take your time over the body. Look for panel gaps that are not even, paint that does not match between panels, and overspray on the rubbers and trim, all marks of a repaired crash. Check the sills and the base of the windscreen for rust, a slow, expensive problem that cheap paint will not fix.

A fridge magnet run along the lower doors finds bog, which is body filler sitting over rust or crash damage. It is a trick worth doing on any car that looks freshly detailed. Then the tyres. Uneven wear, worn on one edge or bald in patches, points to suspension or alignment trouble, not a detail to wave off.

Under the bonnet: look for the clean-up, not the shine

A steam-cleaned engine bay can be a warning dressed up as a courtesy. Sellers clean engines to show them off, but they also clean them to hide leaks. Look for fresh oil around the rocker cover, coolant staining and cracked belts. Pull the dipstick and check the oil’s colour and level. Milky oil under the oil cap is a red flag for a blown head gasket or a tired engine.

Have a look at the battery as well. A date sticker tells you its age, and terminals crusted in white corrosion tell you how it has been treated.

The cold start and the test drive

Arrive cold. A car warmed up before you get there is hiding its starting problems, so ask the seller not to run it until you are ready. When it starts, watch the exhaust. Blue smoke tends to mean burning oil, white smoke can mean coolant getting into the engine, and black smoke points to a fuel problem. A puff on a cold morning is common; steady smoke once it warms is not.

On the drive, test everything. Does it pull to one side? Do the brakes feel firm and even? Does the gearbox or clutch do what you ask without noise? And keep an eye on the dash, because a warning light that shows up on your test drive will not disappear once you pay.

Roadworthy, eSafety and the unregistered discount

State rules differ, so confirm the details with your state or territory transport agency before you commit. As a guide, Victoria and Queensland generally require a current certificate to transfer a registered car, while an unregistered car needs an inspection before it can be registered anywhere. Some states call the certificate a roadworthy, others an eSafety check. If the ad says “no roadworthy”, that certificate is a cost you will wear, so price it into your offer. A roadworthy certificate when buying a used car can be the difference between driving it home and paying for a tow.

Negotiate after the inspection, never before

Do every check first and talk price after, because a genuine fault found is a genuine discount earned. A worn tyre or a weeping seal is a reason to adjust the number, not a reason to walk away. If you would rather not trust your own eye, a used car pre purchase inspection by a mechanic is cheap insurance against an expensive mistake.

When you do agree, keep the deposit small and get it in writing. On the day, write a receipt with both names, the car’s details, the price and the date, and have both of you sign it. No receipt, no deal.

The bottom line

Papers, body, engine, drive, then price. That order keeps a cheap car cheap. Skip a step and the car picks the order for you, usually with a repair bill attached. The cheapest repair you will ever do on a used car is the one you find before you buy it, and it costs nothing but a bit of your time and a bit of healthy suspicion.

Australian Consumer Law basics – private sales; PPSR – Personal Property Securities Register; your state or territory transport agency (roadworthy and registration transfer rules).