Updated specs are available.
5-speed manual transmission oil type (1990)
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Not yet checked against the factory manual for your car's year. It's verified in the 1990 Mazda MX-5 Miata Workshop Manual; later manuals may differ.
Manual transmission gear oil; API service GL-4 or GL-5; SAE 75W–90 (all season); SAE 80W–90 above 10°C (50°F)
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure
Add oil through the check plug until the level reaches the bottom of the check plug hole.
Applies to
- NA 1990 (B6, 5MT)
- Verified in: 1990 Mazda MX-5 Miata Workshop Manual
Sources
- Part no. 1193-10-89CPage J–8Manual transmission gear oil; API service GL-4 or GL-5; SAE 75W–90 (all season); SAE 80W–90 above 10°C (50°F)Printed: “API service GL-4 or GL-5 All-season: SAE 75W-90 Above 10°C (50°F): SAE 80W-90”