# 5-speed manual transmission oil type (1990)

Canonical URL: https://miatatorque.com/spec/manual-transmission-oil-type-1990/

Applicability: NA 1990 (B6, 5MT)

Confidence: fsm

Manual transmission gear oil; API service GL-4 or GL-5; SAE 75W–90 (all season); SAE 80W–90 above 10°C (50°F)

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "manual-transmission-oil-type-1990",
  "name": "5-speed manual transmission oil type (1990)",
  "aliases": [
    "5-speed manual transmission oil type",
    "Manual transmission gear oil",
    "API service GL-4 or GL-5",
    "SAE 75W–90 (all season); SAE 80W–90 above 10°C (50°F)"
  ],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1990,
        1990
      ],
      "engines": [
        "B6"
      ],
      "trans": [
        "5MT"
      ]
    }
  ],
  "kind": "fluid",
  "fluid": {
    "type": "Manual transmission gear oil",
    "viscosity": "SAE 75W–90 (all season); SAE 80W–90 above 10°C (50°F)",
    "standard": "API service GL-4 or GL-5"
  },
  "procedure": {
    "notes": "Add oil through the check plug until the level reaches the bottom of the check plug hole."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "J–8",
      "as_printed": "API service GL-4 or GL-5\nAll-season: SAE 75W-90\nAbove 10°C (50°F): SAE 80W-90",
      "fluid": {
        "type": "Manual transmission gear oil",
        "viscosity": "SAE 75W–90 (all season); SAE 80W–90 above 10°C (50°F)",
        "standard": "API service GL-4 or GL-5"
      },
      "document": {
        "id": "fsm-1990",
        "tier": 1,
        "title": "1990 Mazda MX-5 Miata Workshop Manual",
        "part_number": "1193-10-89C",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1990,
              1990
            ],
            "engines": [
              "B6"
            ]
          }
        ],
        "url": "https://archive.org/details/1990-mazda-mx-5-miata-workshop-manual_202411"
      }
    }
  ],
  "jobs": [
    "trans-fluid"
  ],
  "system": "transmission",
  "component": "transmission-fluids",
  "componentName": "Fluids & capacities",
  "url": "https://miatatorque.com/spec/manual-transmission-oil-type-1990/"
}
```