DCT Flush question
Race Director
Joined: Mar 2007
Posts: 11,368
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It is a different question if you want to know if the dealers actually follow the procedure. Many do, but there are reports on the forum of dealers that, for various reasons (none legitimate in my view) don't do it.
Race Director
Joined: Mar 2007
Posts: 11,368
Likes: 8,526
The hydraulic system flush is not a fluid drain and replace procedure. Rather, it is a computer initiated (scan tool initiated) process with the car on the ground, engine running and idling. It takes about 8-10 minutes to complete and the idle speed will increase to around 2000 rpm during the process. Its purpose is to move debris from lines and valves and move it to the DCT external canisters filter prior to replacing the filter. In addition to being called by the DCT filter change procedure, it is also called in other diagnostic procedures in an attempt to resolve a transmission problem.
It is not referred to as a "backflush" or "reverse flush" or anything like that. It may or may not internally do that, but there is no descriptive material saying that is what it does. I personally prefer to call it by the name actually used in the Service Manual, which is "hydraulic system flush". Flush, when used alone, for example is often confused with an attempt to drain and flush the transmission case. This transmission has no such procedure. Backflush is often used to describe the use of an external device connected to external transmission lines - there is no procedure like that for this transmission.
When it is time to change the fluid at 45000 miles, or three years, of when the fluid life monitor says, there is a simple drain and fill - with some level and leak tests - but no "flush".
It is not referred to as a "backflush" or "reverse flush" or anything like that. It may or may not internally do that, but there is no descriptive material saying that is what it does. I personally prefer to call it by the name actually used in the Service Manual, which is "hydraulic system flush". Flush, when used alone, for example is often confused with an attempt to drain and flush the transmission case. This transmission has no such procedure. Backflush is often used to describe the use of an external device connected to external transmission lines - there is no procedure like that for this transmission.
When it is time to change the fluid at 45000 miles, or three years, of when the fluid life monitor says, there is a simple drain and fill - with some level and leak tests - but no "flush".
