Mercedes-Benz W220 automatic gearbox cold jerking and ATF fluid
S500S400
W220 automatic jerks when cold or stays in first gear in freezing weather, what causes it?
The cause varies. One cause is the operation of the transmission's torque converter lock-up when cold. Another is too little fluid, because cold fluid takes up the least space. Check the fluid level and leaks and read the fault codes with a diagnostic tool. Workshop service has helped.
Which ATF fluid belongs in the W220's 722.6 automatic and how is it changed properly?
ATF 134 is the right fluid for the 722.6 gearbox when MB236.10 or MB236.14 is required. Just changing the filter and topping up leaves old fluid in the torque converter (about 9 litres). All the fluid is replaced only by flushing, which a workshop does.
Where can the W220's automatic gearbox leak oil after freezing weather?
One known leak point is the seal of the sensor at the bottom of the front of the gearbox. When the seal was replaced, the leak stopped. A workshop confirms the leak location before parts are replaced.
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