The oil in your automatic transmission

ER Classics Desktop 2022

The similarity between what many Americans have been doing for decades and the regulations that car manufacturers used until recently? Never do anything about the automatic transmission.
Factory forgotten for life. It is heartless. And it also often causes problems for classic Americans. The machine then switches poorly, or not at all anymore. A problem that also occurred with new cars. The possible alternative to an actually unnecessary, expensive baking revision is to flush and refill with fresh oil.
So those shift problems also occurred with modern cars with automatic transmissions. The manufacturer indicated that the oil in the automatic transmission never had to be replaced. The oil manufacturers themselves saw it differently.
The result was a whole host of bucket problems at BMW, Benz, Volvo and other brands.
The problems were caused by internal contamination of the machine. The car manufacturers reiterated their opinion and the solution to the problem usually appeared to consist of actively rinsing the container and then refilling it with fresh oil just as actively.
What is the difference between only replacing the automatic gearbox oil and static flushing and cleaning?


  1. The biggest difference is that with just changing the oil, a few liters of oil remain in the torque converter and in the heat exchanger.
    Only by rinsing the automatic transmission (static) with the engine running, with clean oil (using a special machine), can those liters be replaced. This machine ensures that contaminated oil is replaced with new oil everywhere in the machine, torque converter and heat exchanger.


  1. The pre-cleaning of a machine is done with a special machine and a patented cleaner. This cleaner ensures that all deposits, sludge and other contaminants dissolve / soak with the engine and machine running. Because the cleaner is pumped around, all contamination is removed.


  1. The rinsing of the machine is done when the engine is running, leaving no residue in the tank. This means that your machine is spotless on the inside, switches again as it should be, and you can take around 90.000km again. Hmmm. If the switching problems were indeed caused by the pollution ...


What will you notice about the cleaning / rinsing of the machine?


Cleaning and flushing the machine, torque converter and heat exchanger is part of the maintenance of the car and should primarily be seen as a precautionary measure to prevent problems.


If your machine switches properly and has no problems, you can now be sure that it is completely free of pollution and that the next tens of thousands of kilometers will function properly again. The service life of a very important (and expensive) part of your car has been considerably extended.
Some symptoms
claps into gears, excessive skidding when shifting or accelerating, bumping, delayed picking up when shifting, banging when shifting into gear,. swinging speed when driving quietly when the engine is cold clapping into acceleration during kickdown, vibrating at low speeds (especially when the cooking oil is cold), slipping, not wanting to shift up, vibrating at full load at low speed, banging with shifting into gears.
Why flush with a cleaner? Doesn't new oil already have a cleansing effect?
Yes. Precisely for that. To prevent that after your machine has been filled with new oil that loosens stuck dirt and floats around in your machine and again causes problems, it is important to actively rinse the container.
This is the only way to remove all trapped dirt and release stuck valves and clogged oil channels.


A reaction

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  1. I agree with the fact; but I have the impression that coils have been developed in particular to get trays that have covered a lot more than 200k km on the first oil a little better. But when rinsing you get idr only new oil and no new filter etc. That is why ZF offers the premium automatic service, at least in Germany and then in addition to the oil, the shifting brain is also dismantled, cleaned and fitted with new valves, springs and valves. In addition, they replace the filter and associated gaskets, which is better than just flushing. ZF recommends a refresh interval of 80k-100k km; then the residual TBN of the remaining part is still large enough to cause no problems.

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