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Here is my DIY Video for doing the front and rear differential service. Listed below are the fill capacities. Most are not just fill till the fluid comes out like most cars. The correct amount must be put in or you will over fill them.
These specifications are for the 958.1 I'll add more when I have the info available
Front Diff.
Base, S, GTS, Turbo, Diesel, S Diesel, Hybrid, China .5 L Change Quantity
Rear Diff.
Open Diff Diesel, Hybrid, China. .8 Litre Change Quantity
Open Diff Base, S, GTS, Turbo. 1 Litre Change Quantity
Locking Diff Base, S, GTS, Turbo, S Diesel. 1.3 Litre Change Quantity, Fill to lower edge of filler screw
I Don't have access to the specs for the 958.2 if someone have that let me know