Mercedes-Benz W163 transmission oil leaks
Oil is leaking from my W163 transmission, where does the leak usually come from?
The most common leak points are the oil pan gasket and the transmission plug, or connector, where the O-ring of the sleeve lets oil through. Other typical spots are the turbine shaft seal and the rear seal.
Can too much oil cause a leak from the transmission breather?
Yes. Overfilling can be pushed out of the breather, which splashes oil around the car and can make smoke come from the rear. The breather is on top of the transmission, in a black spout with a round cap. The oil level is measured with the engine running.
What should be done about a transmission leak?
The leaking seal or O-ring is replaced. A little extra oil does no harm, but the oil level must not be too low, because the transmission suffers. Also make sure the oil is not coming from outside the transmission, for example from a nearby hose.
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