Vauxhall Firenza

Additional Notes

• All six Vauxhall Firenza configurations covered here use a rear differential, reflecting the rear-wheel-drive layout common to the Firenza platform across its production span.
• The Firenza 1.2 (1971-1972) and 1.6 (1970-1972) share an identical rear differential fluid capacity of 0.7 liter, the smallest figure across all listed configurations.
• The Firenza 1.3 (1972-1975) carries a rear differential capacity of 1.05 liter, a mid-range value that sits between the 0.7-liter and 1.4-liter figures seen in other variants.
• The Firenza 1.8 (1972-1975), 2.0 (1971-1972), and 2.3 (1972-1975) all share a rear differential capacity of 1.4 liters, the largest value in the specification set, consistent with larger or more torque-oriented drivetrains requiring greater lubricant volume in the differential housing.
• A capacity of 1.4 liters for the 2.0 and 2.3 variants indicates a service fill level, meaning the amount of fluid required during a routine drain and refill rather than a full overhaul or housing replacement procedure.
• The 0.7-liter capacity on the 1.2 and 1.6 variants similarly represents a service fill quantity, with the smaller volume reflecting a more compact differential unit suited to lower-displacement engines.
• All six configurations share a uniform service interval of 20,000 km or 6 months under normal use conditions, whichever comes first. The dual-trigger format means the time-based threshold applies when annual mileage is low enough that the distance interval would not otherwise be reached.
• The normal use condition applied across all rows indicates the 20,000 km / 6-month check interval is calibrated for standard operating environments, without adjustment for more demanding driving conditions.
• The 1.3 variant entered production in 1972, the same year the 1.2 and 1.6 variants concluded, representing a generational shift in the smaller-displacement Firenza lineup with a corresponding increase in differential fluid capacity from 0.7 to 1.05 liters.