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Infiniti Q45 1st Gen (G50)

1990–1996 · G50 · sedan

Original Infiniti Q45, sold in the US 1990-1996 on the G50 chassis. 4.5L VH45DE 32-valve DOHC V8 (around 278 hp), paired exclusively to a 4-speed automatic. RWD. Full-size luxury sedan and Infiniti's brand-launch flagship, sold alongside the Lexus LS400 as Japan's first serious assault on the German luxury establishment. Notable for its initial 'no grille' front-end styling, replaced by a more conventional grille for 1994.

Watch out: Parts availability is the headline ownership issue today: VH45DE-specific components (distributor, ignition coils, specific sensors) are increasingly scarce, and the optional hydraulic active suspension (where equipped) is unsupported by Nissan and effectively unrepairable. Owner reports of cracked dashboards, climate control LCD pixel failure, and brittle interior plastics are universal across the run. The engine itself is mechanically robust. Pre-purchase: prefer cars without the active suspension (or with a passive conversion already done), verify the timing chain is quiet on cold start, and budget for cosmetic interior work on any honest survivor.

What your Q45 takes

The parts and fluids that fit this generation. Specs we publish are confirmed against two independent sources; the rest fill in as we verify them.

  • Wiper blades21" driver · 21" passenger✓ VerifiedView
  • Spark plugs4.5L-V8: BKR5EGP✓ VerifiedView
  • BatteryGroup 27 · 625 CCA min✓ VerifiedView
  • Tire sizeNot catalogued yetFind yours soon
  • Engine oilNot catalogued yetFind yours soon
  • Oil filterNot catalogued yetFind yours
  • Engine air filterNot catalogued yetFind yours
  • Cabin air filterNot catalogued yetFind yours
  • Headlight bulbsNot catalogued yetFind yours soon
  • CoolantNot catalogued yetFind yours soon
  • Brake fluidNot catalogued yetFind yours soon
  • Transmission fluidNot catalogued yetFind yours soon
  • Tire pressureNot catalogued yetFind yours soon
  • Key fob batteryNot catalogued yetFind yours soon
  • Power steering fluidNot catalogued yetFind yours soon
  • Differential fluidNot catalogued yetFind yours soon
  • Serpentine beltNot catalogued yetFind yours soon
  • Brake padsNot catalogued yetFind yours soon
  • Wheel fitmentNot catalogued yetFind yours soon
  • Brake rotorsNot catalogued yetFind yours soon
  • ThermostatNot catalogued yetFind yours soon
  • A/C refrigerantNot catalogued yetFind yours soon
  • Fuel filterNot catalogued yetFind yours soon

Full clubhouse — owner Garage Lineage, common problems, year-by-year notes, and product picks — is on the build list.

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