Back to search

2018 PORSCHE 911 TURBO

3.8L Twin Turbo H6•AWD•DCT•gas•turbo
Be the first sponsor for this vehicle

For $99, we generate the full set of step-by-step repair procedures for this exact vehicle. Free for everyone, forever, with your name on every one.

Sponsor — $99
Dead battery / stuck in Park? Emergency neutral procedure for this 911 Turbo →
5-Year Cost of Ownership
$37,020 maintenance + known platform issues
~$7,404/yr · 620¢/mile equivalent · $8,045 maintenance + $9,875 expected platform issues
Compare this engine
vs
3.7L Twin Turbo H6
vs
3.8L H6 Twin Turbo
Common Problems & Known Issues

The 991.2 Turbo with its 3.8L twin-turbo flat-six is generally robust, but when things go wrong they're expensive. The most serious issue is catastrophic engine failure from bearing or bore scoring, often preceded by low oil pressure warnings.

Catastrophic Engine Failure - Bearing/Bore Scoring

Rare · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Low oil pressure warning at idle when engine is hot, Metallic knocking or ticking from engine, especially on cold start, Excessive oil consumption (more than 1 qt per 1,000 mi), Metal particles visible in oil during changes
Fix: Complete engine rebuild or short block replacement. Requires engine removal, typically 40-60 labor hours for full teardown, inspection, machining if salvageable, or short block swap. Many opt for factory reman or aftermarket upgraded internals.
Estimated cost: $35,000-55,000

Transmission Oil Cooler Line Failure

Occasional · high severity
Typical onset: 50,000-90,000 mi
Symptoms: Transmission fluid leak visible under vehicle, Burning smell from leaked fluid hitting exhaust, Transmission temperature warning light, Sudden loss of all gears if catastrophic failure occurs
Fix: Replace failed cooler lines and top off PDK fluid. Lines run along subframe and are prone to chafing. Requires lift access and partial undertray removal, 3-4 hours labor. Critical to address immediately as PDK can be destroyed without fluid.
Estimated cost: $800-1,500

Transmission Mount Failure

Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Vibration through chassis during hard acceleration, Visible sagging or torn rubber on mount during inspection, Drivetrain movement felt through cabin
Fix: Replace worn transmission mount(s). The rear mount takes most abuse on high-torque launches. Requires supporting transmission, 2-3 hours labor. OEM mounts softer than aftermarket options.
Estimated cost: $600-1,200

Turbocharger Wastegate Rattle

Occasional · medium severity
Symptoms: Rattling noise from engine bay at idle, disappears under load, Sound most noticeable on cold starts, No performance loss or check engine light, Noise can occur at any mileage, even under 20,000 mi
Fix: Wastegate actuator arm develops play in bushings. Technically doesn't affect function but annoying. Porsche has updated parts. Requires turbo removal for proper fix, 12-16 hours labor per side. Many owners live with it.
Estimated cost: $4,000-7,000

PDK Mechatronic Unit Failure

Rare · high severity
Typical onset: 80,000-120,000 mi
Symptoms: Harsh or delayed shifts, Transmission fault warning message, Stuck in one gear or limp mode, Grinding or whining from transmission
Fix: Mechatronic sleeve wear or internal valve body issues. Requires transmission removal and internal overhaul or replacement unit. 20-25 hours labor. Porsche reman units are $8K-12K alone before labor.
Estimated cost: $12,000-18,000

Fuel System Issues - Clogged Filter/Failing Pump

Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Rough idle or misfires under load, Loss of power during acceleration, Check engine light with fuel trim codes, Hard starting when fuel tank below quarter tank
Fix: Fuel filter integral with pump assembly in tank. Full pump replacement typically required, not just filter. Tank must be dropped, 6-8 hours labor. Poor fuel quality accelerates this issue.
Estimated cost: $2,000-3,500
Owner tips
  • Check oil level religiously - these engines can consume oil normally, but sudden increases signal trouble
  • Use only Porsche-approved oil (0W-40) and change every 5,000-7,000 mi regardless of monitor
  • Inspect transmission cooler lines annually, especially if car sees track use
  • Pre-purchase inspections should include borescope cylinder inspection and oil analysis
  • Keep fuel tank above quarter full to preserve fuel pump life
  • Budget $3,000-5,000 annually for maintenance even if nothing breaks
Buy one with comprehensive service records and PPI including borescope inspection - when maintained properly they're incredible, but one neglected example with hidden bearing wear can cost more than the car's value to fix.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
526 jobs across 17 categories
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.
Stuck on a repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Building an app?
Free API access to all this data — 20 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included. Built by the same team.
Try ShopBase →