Jaguar Mark X / 420 (EU)

Differential fluid capacity & service interval

Jaguar Mark X / 420 (EU) differential fluid capacity ranges from 1,5 to 1,6 liters. Service intervals include checks at 4000, 4500, and 5000 km, and changes at 16000, 18000, and 20000 km. The data covers 6 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
  • 420G (1966-1970)
  • Rear
  • Use: Normal
  • Capacity 1,6 liter
  • Check 5000 km
  • Change 20000 km
  • 420G (1966-1970)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,6 liter
  • Check 5000 km
  • Change 20000 km
  • Mark X 4.2 (1964-1966)
  • Rear
  • Use: Normal
  • Capacity 1,6 liter
  • Check 4500 km
  • Change 18000 km
  • Mark X 4.2 (1964-1966)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,6 liter
  • Check 4500 km
  • Change 18000 km
  • Mark X 3.8 (1961-1965)
  • Rear
  • Use: Normal
  • Capacity 1,5 liter
  • Check 4000 km
  • Change 16000 km
  • Mark X 3.8 (1961-1965)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,5 liter
  • Check 4000 km
  • Change 16000 km

Additional Notes

  • The Jaguar Mark X / 420 (EU) rear differential fluid capacity varies by engine variant, with the Mark X 3.8 holding 1.5 liters and both the Mark X 4.2 and 420G holding 1.6 liters.
  • The Mark X 3.8 (1961-1965) specifies a fluid check interval of 4000 km under normal use conditions, the shortest check interval across all three variants covered in these specifications.
  • The Mark X 3.8 (1961-1965) rear differential fluid change interval is set at 16000 km under normal use, which is the lowest change interval among the variants listed.
  • The Mark X 4.2 (1964-1966) carries a check interval of 4500 km and a change interval of 18000 km under normal use, placing both figures between the intervals specified for the 3.8 and 420G variants.
  • The 420G (1966-1970) has the longest check interval at 5000 km and the longest change interval at 20000 km under normal use conditions, both figures being the highest in the specification set.
  • In each variant, the standard rear differential and the limited slip rear differential share identical capacity and service interval figures, meaning the limited slip configuration carries no separate fluid volume or schedule requirement in these specifications.
  • The 1.6-liter capacity shared by the Mark X 4.2 and 420G differentials represents a modest increase over the 1.5-liter figure of the Mark X 3.8, a difference of 0.1 liters between the earlier and later units.

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