What should I check when buying a used BMW Z3?

On a Z3, check rear subframe and boot floor; cooling system history; oil leaks, on top of the checks for any used car: the body, tyres and engine, a test drive, and the paperwork for money owing, a write-off and the odometer.

Used BMW Z3 Buying Checklist: What to Check

Before you go

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Get the rego or VIN From the ad or the seller. Enter it at the top of this page: the make, model and year should match the ad.
Compare the price With what similar cars are advertised for.
Ask the seller How long they have owned it, why they are selling, any accidents and any money owing.
Ask for the service book And for the engine to be cold when you arrive.
Meet in daylight In dry weather. For a private sale, at the seller's home: the address should match the registration papers.

Inspection

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Panels and paint Uneven gaps, paint that does not quite match and overspray on rubber seals point to accident repairs.
Rust Under the doors, around the wheel arches and under the boot floor.
Tyres At least 1.5 mm of tread, even wear across each tyre, and a spare.
Glass and lights No chips or cracks in the windscreen, and every light works.
Oil and coolant Check them cold. Milky oil under the filler cap, or oil in the coolant, can mean a head gasket fault.
Cold start Watch the exhaust and listen for rattles in the first few seconds.
Wear inside The pedals, steering wheel and driver's seat should fit the odometer reading.
Warning lights and controls Lights come on with the ignition and go out once the engine runs. Try the air conditioning, windows, locks and screen.
Flood signs A damp smell, water marks or silt under the carpets.

What to check on a Z3

Rear subframe and boot floor Hoist the car and inspect the differential carrier mounting area for cracking, weld failure, or previous repair. Probe any filler or overspray; a poorly repaired floor is worse than an unrepaired one.
Cooling system history Ask for receipts for the water pump, thermostat housing, and expansion tank. If the owner can't produce them, assume it's overdue.
Oil leaks Run a torch under the engine. Some seepage is manageable; heavy oil accumulation across the block suggests prolonged neglect.
VANOS behaviour (six-cylinder) On a cold start, listen for a rattle from the top of the engine that clears when warm. Check pull and response below 3,000 rpm on the test drive.
Soft-top and rear window Raise and lower the hood twice and inspect the rear window perimeter for separation or crazing. Check the boot for water staining near the hood motor.
Warning lights Note any ABS or ASC lights; solvable, but factor the cost into your offer.
History check Run a PPSR check to confirm the car is free of finance, write-off, or stolen history before you commit.

The Z3's known problems, in full

Test drive

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20 minutes or more On slow streets and at highway speed.
Steering and brakes It runs straight with your hands light on the wheel, and stops straight without shudder or squeal.
Gear changes Smooth, with no slipping or flaring revs. In a manual, a clutch that bites near the top of the pedal may be worn.
Noises Knocks over bumps, and whines or hums that rise with speed.
Temperature and leaks The gauge settles and stays put. After the drive, look under the car for fresh drips.

Paperwork

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Money owing A car with finance owing on it can be repossessed after you have paid for it. A PPSR check shows it.
Write-off A statutory write-off can never be registered again, and a repairable write-off needs an inspection first.
Odometer Compare the reading with earlier records of the car: service book stamps, earlier listings and other records.
VIN match The VIN on the car matches the registration papers and the PPSR certificate.
Seller's licence The name and address match the registration papers.
Safety certificate In Queensland the seller needs a current safety certificate, and in Victoria a roadworthy certificate is needed to transfer the registration.
Receipt The date, the price, the VIN and rego, and both names and signatures.

Where to find the VIN on a BMW

Line drawing of a BMW 3 Series sedan (G20), numbered where the VIN is — 3 Series (G20) · where to find the VIN

1. Under the bonnet. Driver's side, engraved into the body.
2. Base of the windscreen. Passenger side. Read it from outside.
3. Lower door pillar. Passenger side. Open the front door to see it.

Drawn on one BMW model: others may differ, and the owner's manual lists the places. Reading a BMW VIN

Older cars also carry a compliance plate, usually under the bonnet or on a door pillar. A car supplied new since mid 2021 may have none: it is entered on the Register of Approved Vehicles instead.

After you buy

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Transfer the rego Into your name before the deadline, usually 14 days.
Stamp duty Worked out on the price you paid or the market value, whichever is higher.
Insurance Before you drive the car away.
Recalls Check that no recall work is outstanding.
Next service Book it on time.
Keep the papers The receipt and the PPSR certificate, with the car's papers.

What it costs on top of the price

Put in the price you're offered for the stamp duty, the transfer fee and a year's rego.

State Price of the car What you pay, GST included

Is the car worth more than the price?

Duty is on the market value when that is higher than the price

Stamp duty (motor vehicle duty): $900
Transfer fee: $42
Rego, 12 months (estimate): $375
On top of the price: $1,317

Duty at Revenue NSW rates as at 27 October 2026 (revenue.nsw.gov.au).

How stamp duty works in NSW

Used BMW Z3 Buying Checklist

The Z3 checklist