LIQUI MOLY Transfer Case and Differential Gear Oil for Porsche, BMW, Audi, Volkswagen, Volvo, and Saab (1967–2025)

LIQUI MOLY 22090 is a gear oil for transfer case and differential service on a wide range of Porsche, BMW, Audi, Volkswagen, Volvo, and Saab models. A transfer case splits engine torque between the front and rear axles on all-wheel-drive cars, and the gear oil inside lubricates its gears and bearings. This oil crosses to more than 20 factory part numbers, including 99991754600, PCG04321012, 83222365987, 31259380, 1161620, and 01V409057. Among Porsche applications, it is the gear oil used to service the 911 and Boxster differential.

LIQUI MOLY was founded in Ulm, Germany, in 1957 and has had its head office in Ulm-Lehr since 1978. The company develops and produces its oils and additives in Germany. Its range of more than 4,000 items includes gear oils, motor oils, greases, and service products.

Technical Details

• Manufacturer: LIQUI MOLY
• Part number: 22090
• Product type: gear oil
• Porsche application: 911 and Boxster differential service
• Factory cross-references include 99991754600, PCG04321012, 83222365987, 31259380, and 01V409057

Installation & Tuning Notes

On the Porsche 911 and Boxster, the differential has no drain plug. Draining is done by evacuating the chamber with a suction device. Fill very slowly, because the differential cover contains a baffle plate.

Common Questions

Is this the same oil as LIQUI MOLY 2048?
Yes. LIQUI MOLY's parts data gives both 22090 and 2048 for this gear oil.

Why does the Porsche differential take so long to fill?
The baffle plate in the cover limits how fast oil can flow in, so pouring quickly causes overflow before the unit is full.

Fitment & Compatibility

Check the fitment table below for the models and years this gear oil fits. Send us your VIN and we will confirm the correct fluid for your drivetrain.