# What to Look For When Buying a Used Mazda6

> What to check on a used Mazda6, sedan or wagon, what a problem looks like, and when to walk away.

Covers: GH (2008–2012), GJ/GL (2012–2025).

Last updated: 13 October 2026. Web page: https://shufti.com.au/checklists/used-mazda6-inspection-checklist. Printable PDF: https://shufti.com.au/checklists/used-mazda6-inspection-checklist.pdf.

## Common Problems on a Used Mazda6

The most commonly reported problems on a used Mazda6 are a touchscreen that freezes or a screen that delaminates, worn suspension parts that knock over bumps, carbon build-up and exhaust filter (DPF) problems on diesel versions, coolant leaks from the water pump, and a slipping or harsh automatic.

### Infotainment Glitches

Owners of Mazda6s report touchscreens that freeze, reboot or lose the phone connection. It's an annoyance more than a danger, but on later cars the screen also runs the reversing camera and settings.

Connect your phone by Bluetooth and by cable (CarPlay or Android Auto, if fitted), make a call, play music and use the navigation. Select Reverse and check the camera comes up straight away and stays on.

Owners also report the screen's top layer bubbling or peeling, which stops the touch working. A software update at a dealer sometimes fixes freezing; a replacement screen costs much more. Ask whether it's had either, and price a fault into your offer.

### Worn Suspension Parts

The rubber bushes and joints that locate the wheels wear with age and rough roads, and owners of Mazda6s report knocks, clunks and vague steering as they go.

On the test drive, drive over speed bumps and rough roads with the radio off and listen for knocks or clunks from the front. Feel for the steering wandering or clunking as you turn the wheel at low speed. Uneven wear on the inside edges of the front tyres is another sign.

Worn bushes and joints aren't expensive one at a time, but a full set adds up, and the wheel alignment needs redoing afterwards. Get a quote and price it into your offer.

### Diesel Carbon Build-Up and Exhaust Filter (DPF) Problems

Diesel Mazda6s used mostly for short trips don't get hot enough for the exhaust filter (DPF) to clean itself, and soot builds up in the engine. Fuel can also get into the oil, so the level rises between services.

Pull the dipstick: the level shouldn't be above the top mark, and the oil shouldn't smell of diesel. On the test drive, watch for a DPF warning light, poor pulling power or black smoke, and ask how often the filter light has come on.

Ask how the car was driven and for receipts for any DPF or engine work. Repairs can be expensive, so if it's overfull, smells of fuel or shows a warning, have a diesel mechanic check it before you buy.

### Coolant Leaks

The water pump circulates coolant to keep the engine cool. A leaking pump lets coolant escape, and an engine that runs low on coolant can overheat and be badly damaged.

With the engine cold, check the coolant tank is at the mark, and look around the engine for coloured crust or wet patches. On the test drive, watch the temperature gauge stays steady, and afterwards check for a sweet smell or drips.

Ask whether the water pump has been replaced, with receipts. A leak is a moderate repair if caught early, so price it into your offer.

### Automatic Gearbox Slipping or Harsh Shifts

Owners report automatics that slip, change harshly or are slow to respond, often on high-kilometre cars or those that have towed.

On the test drive, accelerate gently and then firmly from a stop, and drive through traffic. Feel for revs rising without the car speeding up, thumps between gears, a delay into Drive or Reverse, and listen for a whine.

Ask when the gearbox fluid was last changed and whether it's had any repairs, with receipts. If it slips, have a mechanic check it before you buy.

## Which Mazda6 Years to Avoid?

No Mazda6 year is one to avoid outright. Which problems a particular car has depends on its generation, its engine and how it was used, so judge the one in front of you rather than the year alone, starting with its recalls and reported faults (Shufti looks these up from the listing).

- **GH (2008–2012).** Every one is now over 10 years old, so condition and history count for more than the year: look hard for rust, worn suspension and leaks, and check whether a timing belt (if it has one) has been replaced.
- **GJ/GL (2012–2025).** Most have done enough kilometres for wear items to come due: check the service history for regular servicing, and whether tyres, brakes and the battery need replacing.

## Mazda6 Inspection Checklist

Tick it if it's fine. Cross it if it isn't, and note what you found so you can price it into your offer.

- Safety critical: Affects how safely it drives or protects you in a crash. Best to have a mechanic check it before you buy.
- Negotiate: Costs money to fix, from wear to major repairs. Get a quote and take it off the price.

### Before You Go

- [ ] **Get the VIN and rego** before you travel. A seller who won't share them is a red flag on its own.
- [ ] **Know what you're looking at:** petrol, turbo petrol or diesel; manual or auto. Diesel and turbo checks below are marked.
- [ ] **Ask how it was used:** private, fleet or rideshare; short trips, towing or long country runs?
- [ ] **Ask for the engine to be cold,** go in daylight, and bring a torch, paper towel and a friend.

### Exterior

- [ ] **Panels and paint.** Uneven gaps, mismatched colour or overspray on seals and trim mean crash repair. (Negotiate)
- [ ] **Paint on the roof, bonnet and boot.** Faded or peeling clear coat on cars left in the sun. (Negotiate)
- [ ] **Hail and dents.** Look along the roof and bonnet at a low angle to the light for small dimples. (Negotiate)
- [ ] **Wheels.** Kerbed or cracked alloys. A badly kerbed wheel can be bent, causing vibration. (Negotiate)
- [ ] **Rust** on older cars: wheel arches, sills, door bottoms and the boot lid. (Negotiate)
- [ ] **Lights and glass.** All lights work, no condensation inside; windscreen free of chips in the driver's view. (Negotiate)
- [ ] **VIN plate** (in a door frame or under the bonnet) is there, untouched, and matches the papers.

### Under the Bonnet

- [ ] **Engine oil** between the dipstick marks, brown not black. Old, dark oil means servicing has been skipped. (Negotiate)
- [ ] **Diesel: oil level** not above the top mark, and not smelling of diesel. A rising level usually comes from short trips interrupting the exhaust filter's self-clean. (Negotiate)
- [ ] **Coolant** at the mark and brightly coloured. Rusty or oily coolant, or regular top-ups, needs a mechanic. (Negotiate)
- [ ] **Brake fluid** (small tank at the back of the engine bay) is clear to light amber, not dark. (Negotiate)
- [ ] **Belts, hoses and battery.** No cracked belts or swollen hoses. Cars with stop-start need a special battery; check its date sticker. (Negotiate)
- [ ] **Leaks.** Wet oil on the engine or turbo pipes is a leak. (Negotiate)
- [ ] **Cold start.** Starts easily and settles to a smooth idle. A rattle for the first few seconds, or smoke, needs a mechanic. (Negotiate)

### Underbody and Wheels

- [ ] **Tyres** above the wear bars, worn evenly and under ~6 years old. Wear on one edge only means the wheels are out of line. (Negotiate)
- [ ] **Rust and crash repairs.** Rust on the floor or around the suspension; bent metal, fresh welds or new black coating in one spot. (Safety critical)
- [ ] **Drips** under the car, and oil stains where it's normally parked. (Negotiate)
- [ ] **Suspension.** Push down on each corner: it should bounce back once and settle. Oily shock absorbers leak. (Negotiate)
- [ ] **Brakes.** Deep grooves or a raised edge on the discs mean they're due. (Negotiate)
- [ ] **Exhaust.** Heavy rust, holes or loose heat shields. Diesel: heavy soot can mean a damaged or removed exhaust filter (DPF). (Negotiate)
- [ ] **Towbar.** A worn tow ball means lots of towing; check the wiring plug works. (Negotiate)

### Interior and Electrics

- [ ] **Warning lights.** Key to "on": every dash light comes on, then goes out once running. An airbag, brake, engine or exhaust filter light that stays on needs explaining. (Safety critical)
- [ ] **Water leaks.** Damp carpet, a wet boot floor or a stained headlining. A damp headlining can mean blocked sunroof drains. (Negotiate)
- [ ] **Wear matches the kilometres.** Steering wheel, gear selector, pedals and driver's seat bolster. (Negotiate)
- [ ] **Seatbelts** pull out fully, retract and latch, with no fraying. (Safety critical)
- [ ] **Air con** blows cold within a minute or two, without a musty smell; heater gets hot. (Negotiate)
- [ ] **Electrics.** Screen and control knob, Bluetooth/CarPlay, cameras, sensors, windows and sunroof. Count the keys. (Negotiate)

### Test Drive

- [ ] **Automatic.** Smooth changes with no slipping, flare or thump into Drive or Reverse. (Negotiate)
- [ ] **Manual.** In 4th at 50 km/h, floor it: if revs rise faster than speed, the clutch is slipping. (Negotiate)
- [ ] **Engine.** Pulls smoothly with no stutter, sudden power loss or smoke. Diesel: ask how often the exhaust filter light has come on. (Negotiate)
- [ ] **Brakes.** Firm pedal; stops straight with no pulling, pulsing or grinding. (Safety critical)
- [ ] **Steering and suspension.** Drives straight; no knocks over bumps or clunks through the wheel. (Negotiate)
- [ ] **Noises at speed.** A hum that grows with speed is often a worn wheel bearing. (Negotiate)
- [ ] **Afterwards,** check for new drips, a steady temperature gauge and no hot smells. (Negotiate)

### Documentation

- [ ] **Seller's ID** matches the rego papers, and the VIN matches on the papers and VIN plate.
- [ ] **Service history.** Logbook stamped on time, with receipts. Diesels need on-time oil changes; ask for receipts. (Negotiate)
- [ ] **Engine work.** Ask whether the engine has ever been repaired or replaced, and get the paperwork. (Negotiate)
- [ ] **Fleet or rideshare records.** Ask directly how it was used, and ask for the log. (Negotiate)
- [ ] **Warranty.** A newer Mazda6 may still be under Mazda's new-car warranty. Check the start date and that servicing kept it valid.
- [ ] **Rego and roadworthy.** Rego checked online; roadworthy supplied if your state requires one on sale. (Negotiate)

## Stay Safe

Never go under a car held up only by a jack, and never open the radiator or coolant cap on a hot engine. Keep hands, hair and loose clothing clear of fans and belts when the engine is running, and do checks under the bonnet with it switched off where you can. On the test drive, hold a current licence, confirm the car is registered and insured, obey road rules, and only brake hard when the road behind is clear. Meet in a safe, public-facing place, take someone with you, and don't carry large amounts of cash to a viewing.

## Disclaimer

Shufti is not affiliated with or endorsed by Mazda; Mazda and Mazda6 are trademarks of Mazda Motor Corporation. Figures are counts from Shufti's analysis of official records and published reports, not a statement that any particular vehicle is affected. This checklist is general information only and is not professional, mechanical, legal or financial advice. It covers common checks, not every possible fault, and a car can pass every item here and still have problems. It is not a substitute for a pre-purchase inspection by a qualified mechanic, which is worth considering before you buy, especially if anything tagged Safety critical turns up. Repair costs vary widely; get your own quotes. Roadworthy, registration and transfer rules differ by state, so check with your state road authority. Private sales generally don't come with the consumer guarantees that apply when you buy from a dealer. You use this checklist at your own risk and, to the extent permitted by law, Shufti accepts no liability for any loss, damage or injury arising from its use.

## Buying a Used Mazda6: Questions Answered

### Is a used Mazda6 reliable?

It depends more on the particular car than the badge: how it was driven, loaded and serviced. Work through the commonly reported problems above, read the service history for servicing done on time, and run a PPSR check.

### Which Mazda6 years should I avoid?

No Mazda6 year is one to avoid outright. Which problems a particular car has depends on its generation, its engine and how it was used, so judge the one in front of you rather than the year alone, starting with its recalls and reported faults (Shufti looks these up from the listing).

This checklist covers the GH (2008–2012) and GJ/GL (2012–2025) Mazda6. Problems reported across them include infotainment glitches, worn suspension parts, diesel carbon build-up and exhaust filter problems, coolant leaks and a slipping or harsh automatic.

### How many kilometres is too many for a used Mazda6?

Kilometres matter less than how the car was driven and serviced. A high-kilometre sedan with a full service history can be a better buy than a low-kilometre one that's missed services, towed, or been used as a taxi, rideshare or fleet car. Check the history for regular servicing, and on a hybrid ask for a battery health check.

### Should I get a pre-purchase inspection on a used Mazda6?

It's worth it if you can. A mechanic can spot hidden crash repairs, worn suspension and gearbox problems that are easy to miss on a short test drive. Most buyers don't book one, though, so whatever you decide, check the car thoroughly yourself with this checklist first. See Is a pre-purchase inspection worth it? (https://shufti.com.au/guides/is-a-pre-purchase-inspection-worth-it)

### How do I check a used Mazda6 for money owing or a write-off?

Run a PPSR check with the car's VIN. It shows whether there's finance owing and whether the car has been reported stolen or written off, and costs $2. Run it on the day you pay. See What a PPSR check covers and what it doesn't (https://shufti.com.au/guides/what-is-a-ppsr-check)

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Shufti is an Australian used car inspection app for iPhone and Android that tailors the inspection to the exact car you're looking at. It is not affiliated with Shufti Pro, the identity verification (KYC) company.

From the listing link, it builds every check around that car's make, model and year, odometer reading and the seller's description. It runs PPSR and government recall checks, crosschecks a database of more than 3 million recalls and owner complaints, flags problems from your photos and audio, plans a test drive, produces a shareable report with repair cost estimates, and coaches you through the negotiation.

A check costs $24.99, or $49.99 for three, including PPSR and recall checks. A mechanic's pre-purchase inspection costs $250–350.

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