Intermediate Shaft (IMS) Bearing Failure
medium- Typically appears
- 50–120k mi
- Estimated repair
- $2,500 – $6,000
2006 Porsche
BoxsterConvertible
Convertible
The 2006 Porsche Boxster (987 generation) is a mid-engine, rear-wheel-drive roadster that earns its reputation as one of the most balanced sports cars ever built. The mid-engine layout puts the flat-six behind the seats and ahead of the rear axle, giving it near-perfect 50/50 weight distribution that few cars at any price match. The base 2.7L engine produces 240 hp — adequate but not blistering — while the S model's 3.2L bumps that to 280 hp. Both benefit from Porsche's VarioCam Plus variable valve timing. The 987 Boxster refined everything that made the 986 generation desirable and quietly fixed most of its demons. Build quality is excellent for a 2006 sports car, and the driving dynamics remain a benchmark even by today's standards. The folding soft top is electric and reliable when maintained, and the cabin, while dated, is functional and focused. Owning one in Lake Geneva means accepting that this is a fair-weather car for most owners — the low ground clearance, summer-oriented tires, and soft top all argue against year-round Wisconsin driving. Maintenance costs are real: this is a German performance car that expects premium fuel, specific oil, and scheduled servicing. Do it right and it will reward you with 150k+ miles of genuine driving pleasure.
Reliability
3/5
Verified data
Specs shown for Boxster — the most common configuration.
Other trims may vary in engine, drivetrain, or fuel economy. Sign in to see your vehicle's exact specs.
Engine
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Drivetrain
RWD
Fuel
Premium gasoline
MPG
16 city / 24 hwy / 19 combined
Seats
—
Doors
—
Body
Two Seaters
Overview
AI-curatedThe 2006 Porsche Boxster (987 generation) is a mid-engine, rear-wheel-drive roadster that earns its reputation as one of the most balanced sports cars ever built. The mid-engine layout puts the flat-six behind the seats and ahead of the rear axle, giving it near-perfect 50/50 weight distribution that few cars at any price match. The base 2.7L engine produces 240 hp — adequate but not blistering — while the S model's 3.2L bumps that to 280 hp. Both benefit from Porsche's VarioCam Plus variable valve timing. The 987 Boxster refined everything that made the 986 generation desirable and quietly fixed most of its demons. Build quality is excellent for a 2006 sports car, and the driving dynamics remain a benchmark even by today's standards. The folding soft top is electric and reliable when maintained, and the cabin, while dated, is functional and focused. Owning one in Lake Geneva means accepting that this is a fair-weather car for most owners — the low ground clearance, summer-oriented tires, and soft top all argue against year-round Wisconsin driving. Maintenance costs are real: this is a German performance car that expects premium fuel, specific oil, and scheduled servicing. Do it right and it will reward you with 150k+ miles of genuine driving pleasure.
Known for
- Near-perfect 50/50 weight distribution from mid-engine layout
- Flat-six exhaust note and high-revving character
- Precise, communicative steering and handling
- Well-built 987-generation interior and reliability improvements over 986
- Electric soft top that folds in about 12 seconds
Best for
- Enthusiast drivers who prioritize handling over practicality
- Weekend and fair-weather canyon/backroad use
- Buyers who can budget for proper German sports car maintenance
- Someone wanting a genuine Porsche experience at a fraction of 911 prices
Watch for
- Intermediate shaft (IMS) bearing failure — less common on 987 than 986 but still a known risk
- Oil leak from rear main seal and oil separator (air-oil separator)
- Coolant pipe corrosion and weeping — expensive if ignored
- Convertible top hydraulic leaks and weatherstripping deterioration
- Low ground clearance makes it vulnerable to Wisconsin road debris and frost heaves
Common issues by mileage
6 knownAir-Oil Separator (AOS) Failure
high- Typically appears
- 60–100k mi
- Estimated repair
- $400 – $900
Coolant Distribution Pipe Corrosion / Coolant Leak
medium- Typically appears
- 70–120k mi
- Estimated repair
- $800 – $2,500
VarioCam Plus Timing / VVT Solenoid Issues
low- Typically appears
- 80–130k mi
- Estimated repair
- $300 – $900
Convertible Top Hydraulic Cylinder Leak or Seal Failure
medium- Typically appears
- 60–100k mi
- Estimated repair
- $500 – $1,800
Rear Main Seal (RMS) Oil Leak
medium- Typically appears
- 60–100k mi
- Estimated repair
- $1,200 – $2,800
Maintenance schedule
- 1 Every 5,000–7,500 mi or annually — do not use the OEM 15k-mi interval on a used car Engine oil and filter change with Porsche-approved full-synthetic (5W-40 or 0W-40)
IMS bearing lubrication depends on clean oil. Extended intervals on a used engine accelerate bearing and cam wear. This is the single highest-ROI maintenance item on this car.
- 2 Every 30k mi or at any sign of oil consumption or blue smoke Inspect air-oil separator and breather hoses
A failed AOS pushes oil vapor into the intake and causes fouled plugs, rough idle, and accelerated engine wear. Cheap to fix proactively, expensive to chase after the fact.
- 3 Every 2 years or 30k mi Inspect coolant distribution pipes and hoses for weeping or corrosion
The plastic-to-metal coolant pipes corrode from the inside out. A slow weep becomes a catastrophic overheat quickly. Catching it early is a $100–300 fix; catching it after an overheat can be a $10,000 engine.
- 4 Every 30k mi Spark plug replacement
Mid-engine access is labor-intensive on the Boxster. Don't defer plugs — worn plugs stress the ignition coils and can cause misfires that damage the catalytic converters.
- 5 Every 2 years regardless of mileage Brake fluid flush
Porsche specifies 2-year intervals. High-performance brake systems generate heat that degrades moisture-contaminated fluid. Non-negotiable on a car used for spirited driving.
- 6 Annually, before winter storage Convertible top mechanism and weatherstrip inspection and lubrication
Wisconsin winters are hard on rubber. Weatherstrips that dry-crack let water into the cabin and onto electronics. Hydraulic cylinder seals benefit from being cycled and lubricated before sitting unused.
- 7 Monthly and at every 15°F+ temperature swing Tire pressure check (including spare)
Low-profile performance tires lose ~1 PSI per 10°F drop. Lake Geneva winters will drop pressures significantly, affecting handling and wear — critical on a car this sensitive to tire condition.
- 8 Every fall before storage season Battery load test and tender connection during storage
Most Boxsters in Wisconsin are stored October–April. A discharged battery over winter kills the PCM and radio memory, stresses the battery, and can prevent the convertible top from operating. Use a quality trickle charger/tender during storage.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$1,200 – $3,500
Fuel
Premium (91+ octane) required. At 23 MPG combined and ~10,000 mi/yr, expect $1,400–$1,800/yr at current Wisconsin fuel prices.
Insurance
Expect $1,000–$1,800/yr for a typical driver in Walworth County on a weekend/pleasure policy. Rates drop significantly if stored and not driven year-round.
A well-maintained 2006 Boxster is not a cheap car to own but it is a manageable one if you budget honestly. Routine annual costs (oil, fluids, tires, insurance, premium fuel) run $3,500–$5,500. The wildcard is deferred maintenance — a car that hasn't had the AOS, coolant pipes, or IMS addressed can drop a $3,000–$8,000 repair bill in year one. Pre-purchase inspection by a Porsche-experienced independent shop is money very well spent.
Seasonal care
Lake Geneva, WI Winter
- Store the car if possible — the 4.5-inch ground clearance, summer performance tires, and soft top make this a poor choice for Wisconsin winter driving. Salt intrusion on the underbody is significant.
- Connect a battery tender (maintainer) for the duration of storage to preserve battery health and keep PCM and convertible top memory intact.
- Top off with fresh fuel and consider a fuel stabilizer if storing more than 60 days.
- Cycle the convertible top fully up and verify the weatherstrips seal before parking for winter — a leaking top over months of storage invites mold and electrical damage.
- Wash and thoroughly dry the undercarriage before storage to remove road salt; apply underbody protectant to exposed metal if accessible.
- If driven in shoulder seasons (above 35°F), use winter or all-season tires on a separate wheel set — the stock summer tires lose grip rapidly below 45°F and become dangerous near freezing.
Summer
- Check tire pressure monthly — Lake Geneva summer heat causes pressure to rise ~1 PSI per 10°F. Over-inflation on performance tires reduces the contact patch and increases wear.
- Inspect the A/C system charge and cabin filter before June — the Boxster's cockpit heats quickly with the top up and an underperforming A/C is noticeable immediately.
- Check coolant level and condition at the start of the season; this engine runs warm and a low coolant level in July is a recipe for trouble.
- Inspect convertible top seals for any cracking or gaps that opened during winter storage before driving in rain.
- Watch for oil consumption increase in hot weather — the AOS works harder in high-heat conditions; check oil level every 1,000 mi during summer driving.
Comparable vehicles
2006 BMW
Z4
Same segment, similar price point used, RWD roadster with German engineering. Less exotic, parts slightly easier to source in the Midwest, but similar maintenance cost expectations.
2006 Honda
S2000
RWD roadster with a high-revving engine, excellent driving dynamics, and significantly lower long-term maintenance costs. Less refinement, no frunk, but far cheaper to keep running.
2006 Chevrolet
Corvette
More power, more practicality, and notably lower ownership costs for a sports car at this performance level. Convertible available. Better cold-weather parts support in the Midwest.
2006 Audi
TT
German sports coupe/roadster with AWD option for better Wisconsin usability. Less driver-focused than the Boxster but more livable year-round and somewhat easier to service locally.