Underbody and sill rust
high- Typically appears
- Any mileage, age-dependent
- Estimated repair
- $500 – $3,000
2006 MAZDA
MX-5 MiataConvertible
2.0L I4 · Convertible
The 2006 Mazda MX-5 Miata is the first model year of the third generation (NC), a complete redesign that grew slightly in size and added a proper trunk while keeping the formula that made the original famous: rear-wheel drive, a close-ratio manual gearbox, a lightweight chassis, and near-perfect 50/50 weight distribution. Under the hood sits a 2.0L four-cylinder making 166 hp — a healthy jump from the previous generation. The soft top is manual, and the car weighs in just over 2,400 lbs. For a daily driver this is a tight squeeze — two seats, a small trunk, and zero ground clearance make it impractical for Wisconsin winters or grocery runs. But as a warm-weather weekend car or track-day toy, very few vehicles at any price offer this level of engagement. Build quality on the NC generation is solid, and with routine maintenance these cars routinely clear 150k–200k miles without drama. The 2006 model year was brand new, so early production quirks do exist, but owners report very few serious mechanical gremlins. Rust is the single biggest threat to long-term survival in the upper Midwest — sill panels, frame rails under the rear of the car, and the area around the rear wheel arches are all known spots.
Reliability
4/5
Verified data
Engine
2.0L I4
Drivetrain
RWD
Fuel
Gasoline
MPG
22 city / 28 hwy / 25 combined
Seats
2
Doors
2
Body
Convertible
MSRP
$21,905
Overview
AI-curatedThe 2006 Mazda MX-5 Miata is the first model year of the third generation (NC), a complete redesign that grew slightly in size and added a proper trunk while keeping the formula that made the original famous: rear-wheel drive, a close-ratio manual gearbox, a lightweight chassis, and near-perfect 50/50 weight distribution. Under the hood sits a 2.0L four-cylinder making 166 hp — a healthy jump from the previous generation. The soft top is manual, and the car weighs in just over 2,400 lbs. For a daily driver this is a tight squeeze — two seats, a small trunk, and zero ground clearance make it impractical for Wisconsin winters or grocery runs. But as a warm-weather weekend car or track-day toy, very few vehicles at any price offer this level of engagement. Build quality on the NC generation is solid, and with routine maintenance these cars routinely clear 150k–200k miles without drama. The 2006 model year was brand new, so early production quirks do exist, but owners report very few serious mechanical gremlins. Rust is the single biggest threat to long-term survival in the upper Midwest — sill panels, frame rails under the rear of the car, and the area around the rear wheel arches are all known spots.
Known for
- Best-handling car per dollar in its class
- Lightweight, responsive 2.0L engine
- Exceptionally reliable drivetrain
- Timeless roadster design with improved NC refinement
- Massive enthusiast community and parts availability
Best for
- Weekend and fair-weather driving enthusiasts
- Autocross and track day participants
- Buyers wanting a second fun car on a budget
- Drivers who prioritize feel and feedback over comfort
Watch for
- Underbody rust from road salt — critical in Wisconsin
- Soft top weatherstripping and window deterioration
- Power steering rack leaks on higher-mileage examples
- Catalytic converter and O2 sensor issues as mileage climbs
- Clutch wear if the car was used on track
Common issues by mileage
6 knownSoft top weatherstripping and rear window delamination
high- Typically appears
- 80k–150k mi
- Estimated repair
- $150 – $800
Power steering rack leak
medium- Typically appears
- 80k–120k mi
- Estimated repair
- $400 – $900
Oxygen sensor / catalytic converter degradation
medium- Typically appears
- 100k–150k mi
- Estimated repair
- $200 – $900
Cam phaser / VVT solenoid issues from neglected oil changes
low- Typically appears
- 80k–130k mi
- Estimated repair
- $300 – $1,200
Clutch wear (especially track-driven cars)
medium- Typically appears
- 60k–100k mi
- Estimated repair
- $600 – $1,100
Maintenance schedule
- 1 Every 5,000 miles or 6 months Engine oil and filter change
The MZR 2.0L's cam phasers are sensitive to oil quality and level. Fresh oil is the single best thing you can do to extend this engine's life. Use the manufacturer-spec viscosity (5W-30).
- 2 Every spring and fall Inspect and clean soft top drain tubes
Clogged drain tubes let water pool in the interior and accelerate sill rust from the inside out — a major problem in salt-belt states.
- 3 Every spring after winter storage, or monthly if driven in winter Underbody wash and rust inspection
Wisconsin road salt is the number-one killer of Miatas. Pay close attention to the rear subframe, sills, and frame rails. Touch up any bare metal before it spreads.
- 4 Every 60,000 miles Spark plug replacement
Worn plugs increase misfires and put unnecessary load on ignition coils. Straightforward DIY job on this engine.
- 5 Every 2 years Brake fluid flush
Brake fluid is hygroscopic. With track use or aggressive driving, degraded fluid raises boiling point risk. Two-year intervals are standard for this application.
- 6 Every 15,000 miles Check and top off power steering fluid
The hydraulic rack on the NC is known to weep fluid at higher mileage. Catching a low level early prevents accelerated rack wear.
- 7 Every year Inspect soft top weatherstripping and rear window
UV degradation and Wisconsin freeze-thaw cycles crack the seals and cause the plastic rear window to yellow or delaminate. Early treatment with a vinyl conditioner extends life significantly.
- 8 Every 60,000 miles or 5 years Coolant flush
Mazda's long-life coolant does eventually deplete its corrosion inhibitors. Fresh coolant protects the aluminum engine components, especially important before winter storage.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$400 – $900
Fuel
At 25 MPG combined and Wisconsin average gas prices, expect roughly $1,200–$1,600/year for a typical 10k-mile driver. Premium fuel is not required.
Insurance
Generally low — this is a two-seat sports car but a small, inexpensive one. Expect $900–$1,400/year for full coverage depending on driver profile. Seasonal/storage policies are common and cheaper for warm-weather-only drivers.
The NC Miata is inexpensive to maintain by sports car standards. Parts are widely available and labor is straightforward — nothing exotic or dealer-only. The biggest wildcard cost is rust remediation if the car was not stored or washed regularly. A well-kept example kept off winter roads is genuinely cheap to own.
Seasonal care
Lake Geneva, WI Winter
- Store the car if possible — the Miata's low ground clearance and RWD make it genuinely hazardous in Wisconsin snow and ice, and road salt is devastating to the unibody.
- Before storage, do a full oil change so acids from combustion byproducts don't sit in the engine all winter.
- Use a quality battery maintainer (trickle charger) during storage — extended periods of inactivity will kill the battery in sub-zero temps.
- Overfill tires to the high end of the recommended range before storage to reduce flat-spotting from sitting.
- Top off fuel and add a fuel stabilizer if storing longer than 60 days.
- If you must drive it in winter, flush wiper fluid and use a -40°F rated winter blend. The low hood line means road spray hits the windshield constantly.
Summer
- Check tire pressure frequently — Wisconsin summer heat can push pressure 4–6 PSI above the cold reading, increasing wear and reducing grip.
- Inspect the soft top for cracking or seam separation before the rainy season; a leaking top leads to wet carpet and mold fast.
- Have the A/C system checked in spring — the system is small and loses refrigerant gradually; if it's blowing warm after storage it likely needs a recharge.
- Heat soak can affect the intake air temperature after sitting in the sun; give the car a minute to circulate before pushing it hard.
- Clean and condition soft top fabric and the plastic rear window with UV protectant to prevent cracking and yellowing.
Comparable vehicles
2006 Honda
S2000
Also a two-seat RWD roadster, higher-revving and more aggressive, but heavier on the wallet to maintain and harder to find clean. A step up in driving intensity.
2006 Toyota
MR2 Spyder
Lighter, mid-engined two-seater in a similar price bracket. Production ended in 2005 so comparable used examples exist. Parts are harder to find than Miata.
No catalog match
2006 Pontiac
Solstice
American-market roadster launched the same year, similarly priced, RWD with a 2.4L I4. Softer steering feel and less refined than the Miata; reliability is lower.
2006 Saturn
Sky
Shares the Kappa platform with the Solstice. Better interior trim than the Pontiac but same mechanical trade-offs versus the Miata. Also discontinued, limiting parts support.
No catalog matchIf you're shopping for one
Red flags
- Any rust on the sills or subframe — repair costs can exceed the car's value quickly.
- Soft top that leaks or has stained/moldy carpet underneath — indicates long-term water intrusion.
- High clutch engagement point or slipping under load — track abuse is common on these cars.
- Check engine light with unresolved O2 sensor or cam timing codes — can indicate neglected oil changes or VVT wear.
- Mismatched tire brands or severely uneven wear — suggests alignment or suspension issues from curb strikes or track incidents.
What to inspect
- Lift the car and inspect sills, rear subframe, and frame rails thoroughly for rust — this is the most important inspection point on any Wisconsin-region Miata.
- Check soft top operation through full cycle; look for tears, seam separation, and rear window clarity/delamination.
- Check for power steering fluid seepage around the rack boots and reservoir.
- Test the A/C — recharging is cheap, but a dead compressor is not.
- Check clutch engagement point: if it grabs very high, the clutch is worn, especially likely on track-driven examples.
- Look for oil consumption or milky residue on the oil cap (head gasket concern, rare but worth checking).
- Confirm the battery date — Miatas that sit seasonally eat batteries. If it's over 4 years old, budget a replacement.