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Buying guide

Ford Mustang Mach 1 S550 (2015 to 2023): buying guide, problems and NZ numbers

The Ford Mustang Mach 1 S550 was built from 2015 to 2023 as a coupe, with a manual or automatic gearbox, rear wheel drive and petrol power. Chassis code: S550. Redline has a curated guide to its 8 most reported weak points, from owner club and specialist sources.

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Key facts

Years
2015 to 2023
Chassis codes
S550
Body types
Coupe
Gearboxes
Manual, Automatic
Drive
RWD (rear wheel drive)
Fuel
Petrol

On NZ roads

Counting every one on the NZ register. The first look can take up to 15 seconds.

Known weak points

Curated by Redline from owner club and specialist sources Commonly reported by owners and specialists for the Ford Mustang S550 (2015 to 2023). Not every car has these; check this one.

  1. Cold piston slap (facelift 5.0)

    A rattle at 1500 to 3000 rpm when cold is attributed to piston slap and could score the cylinders.

    Where to look
    The 5.0 V8 engine
    How to test
    Start from cold and listen as you drive at low revs. A bore scope inspection shows cylinder damage.
    Cost if it needs fixing
    High cost engine work

    Sources: pistonheads.com (opens in a new tab), fastcar.co.uk (opens in a new tab)

  2. Oil cooler rupture (early cars)

    The oil cooler on early 2015 and 2016 cars can rupture, leaking oil outside or into the coolant.

    Where to look
    The oil cooler on the engine, and the coolant reservoir
    How to test
    Look for oil on the floor and round the engine, and check the coolant for oil.
    Cost if it needs fixing
    High cost Fast Car quotes a US bill of about 12,000 dollars; a preventive kit is far cheaper

    Sources: fastcar.co.uk (opens in a new tab)

  3. Manual shift forks

    The MT82 shift forks can break, mainly on hard driven 2018 cars.

    Where to look
    The gear lever
    How to test
    Check every change is smooth, especially 3rd and 4th.
    Cost if it needs fixing
    High cost gearbox work

    Sources: pistonheads.com (opens in a new tab), fastcar.co.uk (opens in a new tab)

  4. 10 speed auto valve body (facelift)

    Late, unresponsive or missing shifts on the 10 speed auto are mostly traced to faulty valve bodies.

    Where to look
    The 10 speed automatic
    How to test
    Drive in every mode and feel for late or missed shifts.
    Cost if it needs fixing
    High cost a big hours repair job

    Sources: pistonheads.com (opens in a new tab)

  5. 6 speed auto clunk (pre 2018)

    A clunk going from neutral into drive or reverse points to a worn front transmission flange.

    Where to look
    The 6 speed automatic
    How to test
    Shift from neutral to drive and to reverse with the car still and listen.
    Cost if it needs fixing
    Medium cost flange replacement

    Sources: fastcar.co.uk (opens in a new tab)

  6. Rear wheel bearings and driveline hum

    Rear wheel bearings can fail early, and a hum at about 65 to 95 km/h can come from the driveshaft, bearings or tyres.

    Where to look
    The rear hubs and driveshaft
    How to test
    Listen for a rumble at steady speed on a smooth road.
    Cost if it needs fixing
    Medium cost bearings or driveshaft balance

    Sources: fastcar.co.uk (opens in a new tab)

  7. Corrosion and panel gaps

    Rust bubbles appear on wheel arches and bonnet edges because factory protection is weak, and pre facelift panel gaps are uneven.

    Where to look
    The wheel arches, bonnet edges, floor pan, boot floor and rear quarters
    How to test
    Look along the arches and bonnet edge and underneath with a torch. Compare gaps side to side.
    Cost if it needs fixing
    Medium cost paint and rust repair

    Sources: fastcar.co.uk (opens in a new tab), pistonheads.com (opens in a new tab)

  8. Battery harness recall

    A recall covered battery wiring that ran too close to the exhaust manifold and could cause a fire.

    Where to look
    The battery harness near the exhaust manifold
    How to test
    Confirm with a Ford dealer that the recall work, including insulation, has been done.
    Cost if it needs fixing
    Low cost free recall work

    Sources: fastcar.co.uk (opens in a new tab), pistonheads.com (opens in a new tab)

General guidance from owner and specialist sources. Check the specific car with an independent inspection. Researched 3 November 2026.

What the cost bands mean
  • Low: a small job. Typically a few hundred dollars or less at an NZ workshop, often a DIY fix.
  • Medium: a proper workshop job. Typically several hundred to a couple of thousand dollars.
  • High: a major job. Typically several thousand dollars or more, enough to change what the car is worth.

Service items

Questions to ask the seller

  • Is it the 5.0 V8 or the 2.3 EcoBoost, and manual or auto?
  • Have all recalls been completed?
  • Is it pre or post facelift?
  • Does the VIN on the papers match the windscreen and the B pillar sticker?
  • Has it been modified or tuned?

New Zealand notes

  • The S550 was sold new in NZ in factory right hand drive, so check whether a car is NZ new or a converted import.

An S550 suits a buyer who wants a modern V8 coupe with right hand drive from the factory and checks the recalls.

US recalls

Looking up US recall data.

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