These Automatic Transmission Filter Kits come with a transmision filter and gasket you need to service the transmission in your B5 S4 (all), B5 A4 (all), C5 A6 (all except 4.2l V8) and C5 Allroad (all). We also sell high quality Redline Synthetic Transmission fluid in this section of our store as well. Read below about fill recomendations.
Why service your Automatic Transmission?? Well like in a manual transmission an Automatic Transmission has a clutch, well actually multiple clutch packs. It has multiple friction plates in each clutch pack and multiple clutch packs in an automatic transmission. The problem with this is that just like a clutch in a manual transmission or brakes (another friction material), is that the material is worn off due to friction during each shift. With a manual transmission this just sits in your bellhousing and builds up as dust and with brakes it just builds up on your wheels and brake parts which is no big deal and doesn't wear any parts out prematurely. But in an automatic transmission where the clutches are covered in fluid the dust particles have nowhere to go, instead they get into the transmission fluid which the filter should technically filter out. However after roughly 40k to 75k miles the filter just can't collect any more dust particles or it just can't filter as well just like any other filter as it ages. Even though the fluid is ok, it just gets dirty. So you basically run dusty friction material through your transmission thus shortening its life. Even though with most new transmissions they say it uses a "lifetime" fluid and requires no servicing, in our experience we still see this dust and build up in transmissions we take apart. So why not clean this stuff out and get some fresh fluid in your trans along with a fresh filter. The bottom line is, it is cheaper to keep clean fluid and a good filter in your transmission than replace it. With that being said, this won't make it last forever since it does have clutches that wear out, but at least it will protect your transmission bearings, seals and bushings from excess wear and get the longest service life out of your transmission as possible.
NOTE Regarding fill capacities.
The total fill capacity of this 6-speed transmission is 9 liters (9.5 quarts). However, if you are just pulling the pan to do a trans service (drain and refill) it usually takes 5 liters (5.3 quarts) that is why we recommend getting 5 liters for just a service (5.3 quarts). If your car has been apart for a while due to drainback from the quarter this can require 1 to 2 more liters, we have seen as high as 7. If you were replacing the valve body at this time as well plan on needing up to 7 liters (7.4 quarts). If you were installing a new torque converter or new transmission you would most likely need 7 to 9 liters since the torque converter holds almost half the fluid. So if you need more fluid we sell it as well in this section.
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