# Differential oil type and capacity (1999)

Canonical URL: https://miatatorque.com/spec/differential-oil-capacity-1999/

Applicability: NB 1999 (BP-4W)

Confidence: fsm

1 L / 1.06 US qt / 0.88 Imp qt · Differential gear oil; API GL-5; SAE 90 above −18°C (0°F); SAE 80 below −18°C (0°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": "differential-oil-capacity-1999",
  "name": "Differential oil type and capacity (1999)",
  "aliases": [
    "Differential oil type and capacity",
    "Differential gear oil",
    "API GL-5",
    "SAE 90 above −18°C (0°F); SAE 80 below −18°C (0°F)"
  ],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        1999,
        1999
      ],
      "engines": [
        "BP-4W"
      ]
    }
  ],
  "kind": "capacity",
  "capacity": {
    "l": [
      1,
      1
    ],
    "qt_us": [
      1.06,
      1.06
    ],
    "qt_imp": [
      0.88,
      0.88
    ]
  },
  "fluid": {
    "type": "Differential gear oil",
    "viscosity": "SAE 90 above −18°C (0°F); SAE 80 below −18°C (0°F)",
    "standard": "API GL-5"
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "03–50–1",
      "as_printed": "API service GL-5\nAbove −18 °C {0 °F}: SAE 90\nBelow −18 °C {0 °F}: SAE 80\n1.00 {1.06, 0.88}",
      "capacity": {
        "l": [
          1,
          1
        ],
        "qt_us": [
          1.06,
          1.06
        ],
        "qt_imp": [
          0.88,
          0.88
        ]
      },
      "fluid": {
        "type": "Differential gear oil",
        "viscosity": "SAE 90 above −18°C (0°F); SAE 80 below −18°C (0°F)",
        "standard": "API GL-5"
      },
      "document": {
        "id": "fsm-1999",
        "tier": 1,
        "title": "1999 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NB",
            "years": [
              1999,
              2000
            ],
            "engines": [
              "BP-4W"
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1999-2001.pdf"
      }
    }
  ],
  "jobs": [
    "diff-fluid"
  ],
  "system": "driveshaft-differential",
  "component": "driveshaft-differential-fluids",
  "componentName": "Fluids & capacities",
  "url": "https://miatatorque.com/spec/differential-oil-capacity-1999/"
}
```