Hey everyone... figured it was time for a proper Q50 mega thread that covers the most-asked topics for both new and existing owners.
Whether you’re thinking about buying one, just picked yours up, or want to keep it running strong, this post should give you a solid overview.
If you’ve got additions or corrections, drop them in the comments so we can keep this updated.
Technical Service Bulletins (TSBs)
Check for official Infiniti TSBs related to your year/model. Many common issues (especially with steering locks, software updates, and drivetrain quirks) are already documented by Infiniti.
Resources:
Recommended Maintenance Intervals
These are general recommendations that sit between “normal” and “severe” schedules. Always check your manual for the exact interval for your trim (2.0T, 3.0T, Hybrid, AWD, etc.).
Every 5,000 miles / 6 months
- Engine oil + filter (5W-30 or as spec’d)
Every 10,000 – 15,000 miles / 1 year
- Cabin air filter
- Engine air filter
Every 30,000 – 40,000 miles / ~3 years
- Brake & clutch fluid (DOT 4 / 5.1)
- Transmission fluid check (7AT or 9AT)
- Differential fluid (GL-5 75W-90 or as specified)
Every 50,000 – 60,000 miles / ~5 years
- Coolant flush & radiator cap
- Serpentine belt inspection or replacement
- Power steering fluid (if applicable)
Every 80,000 – 100,000 miles
- Spark plugs (Denso FXE24HR11 / NGK DILKAR7B11 depending on engine)
- Full inspection of timing components & turbos (if equipped)
| Mileage Interval |
3,000 |
5,000 |
10,000 |
15,000 |
20,000 |
50,000 |
100,000 |
| Factory Stock |
|
Oil & Filter, Change Inspect Coolant |
|
|
Differential Fluid, Transfer Case Fluid |
Spark Plugs, Transmission Fluid |
Coolant Flush |
| 93 Stock Turbo |
|
Oil & Filter Change, Inspect Coolant |
Clean Intake, Air Filter |
|
Differential Fluid, Transfer Case Fluid, Spark Plugs |
Transmission Fluid |
Coolant Flush |
| E30 Stock Turbo |
Oil & Filter Change, Inspect Coolant |
|
Clean Intake, Air Filter |
|
Differential Fluid, Transfer Case Fluid, Spark Plugs |
Transmission Fluid |
Coolant Flush |
| E50+ Stock Turbo |
Oil & Filter Change, Inspect Coolant |
|
Clean Intake, Air Filter |
|
Differential Fluid, Transfer Case Fluid, Spark Plugs |
Transmission Fluid |
Coolant Flush |
| Upgraded Turbo |
Oil & Filter Change, Inspect Coolant |
|
Clean Intake, Air Filter |
Spark Plugs |
Differential Fluid, Transfer Case Fluid, Transmission Fluid |
|
Coolant Flush |
Chart suggestion credit: u/GABE_EDD Source: Redbox Recommendations
Engine Generations
🔹 2014 – 2015 Q50 (First Generation / VQ37VHR 3.7 L NA)
- Same engine as the G37 - literally a carry-over.
- Uses the 7-speed Jatco RE7R01A transmission.
- Issues & maintenance overlap heavily with the G37 (so guides or TSBs saying “G37” still apply).
- Oil gallery gasket, power-steering fluid, and older-style belt/tensioner items still relevant.
🔹 2014 – 2018 Q50 Hybrid (VQ35HR + Electric Motor)
- Combines a 3.5 L V6 with a single electric motor and lithium-ion pack.
- Uses the same 7-speed auto as the gas model but with an integrated hybrid system.
- Known for inverter-cooling and brake-booster issues on early builds.
- Maintenance requires periodic inverter coolant and battery-cooling service.
🔹 2016 – 2018 Q50 2.0T (M274 2.0 L Turbo I4)
- Mercedes-sourced turbo four-cylinder used in base trims.
- Paired with the 7-speed Jatco RE7R01B transmission.
- Watch for oil consumption, turbo wastegate rattle, and cam-adjuster solenoid leaks.
- Oil changes every 5k miles are strongly recommended due to turbo heat.
🔹 2016 – 2024 Q50 (Second Phase / VR30DDTT 3.0 L Twin-Turbo V6)
- New VR-series engine replaces the long-running VQ.
- Comes in 300 hp (standard) and 400 hp (Red Sport) trims.
- Turbo maintenance adds:
- More frequent oil changes (every 5k mi recommended).
- Coolant checks for turbo lines and heat-soak management.
- Transmission upgrade to RE7R01B, later 9-speed in final years.
- PCV valve and boost-control solenoid checks around 60k mi.
Common Q50 Issues
A mix of community experience and service data — use this as a checklist if you’re buying or troubleshooting.
🔴 High Priority (could leave you stranded)
- Steering Lock Failure: Early Q50s sometimes suffer from electronic steering lock malfunctions that prevent starting. Many owners disable or bypass it entirely.
- Turbo Seal Failure: On VR30 models, turbo seal leaks can lead to oil consumption or smoke; usually after 60K+ miles.
- Fuel Pump Issues: Some models experience hard starts or stalling due to fuel pump failures.
🟠 Medium Priority (inconvenient but manageable)
- Transmission Jerks / Delays: Not uncommon on early 7-speed autos. A fluid change and software update often helps.
- Brake Rotor Warping: Factory rotors can warp quickly; upgraded rotors and pads are common fixes.
- Oil Gallery Gasket (on older 3.7s): Carryover issue from the G37 - still worth watching if you have that platform.
🟢 Low Priority (annoying but not critical)
- Infotainment Glitches: Screen lag or freeze, especially on early dual-screen models. Firmware updates can help.
- Throttle Body Carbon Buildup: Causes rough idle or stalling; easy fix with a good cleaning.
- Sunroof Drain Leaks: If you have a sunroof, inspect drains - leaks can fry the BCM or fuse box if left unchecked.
- Wire Harness Fatigue (trunk lid): Broken wires between the trunk and lid causing backup cam or trunk release issues.
Preventative Maintenance / Upgrades
- Regular oil changes (especially on 3.0T) - these engines hate dirty oil.
- Use high-quality fluids (Motul, Red Line, or OEM-spec).
- Flush coolant and brake fluids more frequently if you drive aggressively.
- Replace plastic coolant couplers with metal versions to avoid catastrophic leaks.
- Consider upgraded end links or sway bar bushings if you’re lowered or track your car.
- Keep an eye on your differential bushing - OEM is fluid-filled and prone to failure.
Drop your own maintenance schedule, mods, or fixes below - I’ll keep this thread updated as we go.
