How much gear oil SAE 80 W90 is going in the rear axle pumpkin of a W109 3.5?

[werminghausen]

Is it the same as with later models - fill up the gear box until it overflows at the upper opening (allen screw)?

[280SE Guy]

The short answer is yes. You have to have the axles in their normal horizontal position not hanging down as if the car was on a lift.

Regards,

280SE Guy

[werminghausen]

Thanks for the info.