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== Z31 quick reference ==

{| class="wikitable" style="width:100%"
! colspan="4" | Engine specs
|-
! Engine !! Displacement !! Power (US) !! Torque (US)
|-
| VG30E (N/A) || 2,960 cc (3.0 L) || 160 hp @ 5,200 rpm || 174 lb·ft @ 4,000 rpm
|-
| VG30ET (turbo) || 2,960 cc (3.0 L) || 200 hp @ 5,200 rpm || 227 lb·ft @ 3,600 rpm
|}

{| class="wikitable" style="width:100%"
! colspan="4" | Engine internal specs
|-
! Engine !! Bore × Stroke !! Compression !! Configuration
|-
| VG30E || 87 mm × 83 mm || 9.0:1 || V6 SOHC 12-valve
|-
| VG30ET || 87 mm × 83 mm || 7.8:1 || V6 SOHC 12-valve + IHI turbo
|-
| VG30ET (W series) || 87 mm × 83 mm || 8.3:1 || V6 SOHC 12-valve + T25 watercooled turbo
|}

=== Oil change ===

{| class="wikitable"
|-
! Engine !! Filter !! Capacity (w/ filter) !! Recommended viscosity
|-
| VG30E || Nissan 15208-43G00 (or equivalent) || 3.75 qt (3.6 L) || 10W-30 (factory) · 5W-30 acceptable
|-
| VG30ET || Nissan 15208-43G00 (or equivalent) || 3.75 qt (3.6 L) || 10W-30 (factory) · 5W-30 acceptable
|}

* Change interval: every 3,000 mi (conventional) or 5,000 mi (synthetic)
* Drain plug torque: 22–29 lb·ft (29–39 N·m)

=== Transmission fluid ===

{| class="wikitable"
|-
! Trans !! Type !! Capacity
|-
| FS5W71C (5-speed MT) || GL-4 MTF (75W-90 or 80W-90) || 2.5 qt (2.4 L)
|-
| RS5F50A (5-speed MT, 1988–89 N/A) || GL-4 MTF (75W-90) || 2.4 qt (2.3 L)
|-
| RE4W03A (4-speed AT) || Dexron II/III ATF || 7.4 qt total (3.2 qt service fill)
|}

=== Coolant ===

* System capacity: ~8.5 qt (8.1 L)
* Factory spec: 50/50 green ethylene-glycol coolant
* Thermostat opens: 82 °C (180 °F)

=== Spark plugs ===

{| class="wikitable"
|-
! Engine !! OEM plug !! Gap
|-
| VG30E || NGK BKR5E-11 / Nissan 22401-01P15 || 1.1 mm (0.043 in)
|-
| VG30ET || NGK BKR6E-11 / Nissan 22401-01P16 || 1.1 mm (0.043 in)
|}

=== Timing belt ===

* Replacement interval: 60,000 mi (96,000 km)
* See [[Z31/timingbelt|Timing belt replacement]] for full procedure

=== Tire sizes (stock) ===

{| class="wikitable"
|-
! Year !! Front !! Rear
|-
| 1984–1985 || 205/60R15 || 225/50R15
|-
| 1986–1989 || 205/60R15 || 225/50R15
|-
| 1987–1989 2+2 || 205/60R15 || 225/50R15
|}

* Factory rim: 15 × 6.5 JJ (front), 15 × 7.0 JJ (rear)