Mercedes-Benz W164 7G-Tronic automatic gearbox slipping
My W164 automatic gearbox slips and drive is lost while driving, what is wrong?
In the 7-speed 722.9 gearbox, slipping is often caused by a fault in the torque converter (turbine) or the oil pump. Clogged screens in the valve body can cause the same. The cause is found by checking the oil and filter.
What does metal in the oil and filter tell about the W164 gearbox?
Metal shavings or clutch material in the filter and oil indicate internal wear, often in the turbine or oil pump. If the filter is full of metal, the problem is not the oil level but a badly damaged gearbox.
Which ATF oil belongs in the W164 7G-Tronic gearbox?
This gearbox uses red oil, specification 236.14. Blue 236.15 belongs in newer gearboxes, and the wrong oil can make the gearbox jerk. The oil level is checked with a warm gearbox at the correct temperature.
How can slipping be prevented in the W164?
The correct ATF and regular oil changes are the most important. The oil should be changed about every 40,000 km, because the gearbox turbine is marginally dimensioned.