The recommended frequency: each 24 000 km of a run or 12 months.
Install the car on the elevator in horizontal position.
Turn out a jellied carving stopper. A finger check the oil level which has to be at the lower edge of a carving opening.
If necessary add oil through an oil-filling opening.
Wrap a jellied stopper.
Make a control trip and check lack of leaks through a carving stopper.