Showing specs for all NA & NB Miatas

Five-speed transmission oil specification & capacity (2004)

2.1 US qt2 L2 L2.1 US qt1.8 Imp qtManual transmission gear oil; API service GL 4 or GL 5; SAE 75W-90 (All season) or SAE 80W-90 (Above 10°C {50°F})
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Fill to the brim of the filler/check hole. The change-control case is a separate quantity.

Applies to
  • NB 2004 (BP-Z3, 5MT)
  • Verified in: 2004 Mazda MX-5 Miata Workshop Manual (electronic manual capture)
Sources
  • 2004 Mazda MX-5 Miata Workshop Manual (electronic manual capture)Tier 1
    Page PDF p. 1401
    2.1 US qt2 L2 L2.1 US qt1.8 Imp qtManual transmission gear oil; API service GL 4 or GL 5; SAE 75W-90 (All season) or SAE 80W-90 (Above 10°C {50°F})
    Printed: “Grade: API service GL 4 or GL 5 Viscosity: SAE 75W-90 (All season) or SAE 80W-90 (Above 10°C {50°F}) Capacity (approximate quantity): 2.0 L {2.1 US qt, 1.8 Imp qt}”

Also in Fluids & capacities