2018 Infiniti Q50: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 18 owner complaints for the 2018 Infiniti Q50 that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11709489 (filed 01/07/2026): “Filing this complaint regarding a safety-related defect involving the turbocharger system on my 2018 infiniti q50. the vehicle has approximately 46,000 miles and is 8 years old. infiniti/nissan has acknowledged through its own technical service bulletins (tsbs) that turbocharger failure on 2016–2018…”
- NHTSA complaint ODI #11704146 (filed 12/10/2025): “Leak in the turbo causing oil to burn and create smoke from the exhaust…”
- NHTSA complaint ODI #11701863 (filed 11/28/2025): “The serpentine belt on my 2018 infiniti q50 sport became contaminated with oil immediately after dealer turbo replacement at the end of august 2025, causing the belt to slip, shred, and be pulled into the engine. this resulted in sudden loss of essential engine functions and poses a significant safe…”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
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Sources
Page last updated .