if i will agree with you about your words
then why in your opinion them still offer this new filter parts if it just cleaning with fuel
>???????!!!

BMW E21 Transmission - Page 1
This section contains the various transmission, driveshaft and rear end parts for your E21 BMW.
Flex Disc-Guibo Couplings
BMW's have a unique driveshaft mounting system called a Guibo coupling. It is essentially a big rubber disc holding the parts of the driveshaft together. It's not uncommon for the coupling to wear out over time. If you hear a clunking sound from underneath the car as you accelerate, chances are, the coupling may be bad.
26-11-1-106-113-M200	Flex Disc-Guibo Coupling, Cars with 4-Speed Transmissions, 320i/is (1976-83), Each Brand: MTC [More Info]	$20.75
26-11-1-225-624-M57	Flex Disc-Guibo Coupling, E21 323i Euro (manual trans from 9/80, all auto), 320i, Each Brand: OEM [More Info]	$35.50
Center Bearings
These bearings run on the outside of the driveshaft and as the name implies, they center the driveshaft in relation to the car's chassis, preventing it from freely spinning. A knocking or whining noise while accelerating, along with odd vibrations from under the car are usually an indication that the bearings require replacement. Here at Pelican, we offer the original OEM replacement parts needed to get your driveshaft spinning freely and transmitting power to the wheels instead of transmitting vibrations though the car and shaking the fillings out of your teeth.
26-11-1-206-502-M61	Center Support with Bearing Assembly for Driveshaft, 320i/is (1976-83), Each Brand: Meistersatz [More Info]	$21.00
Automatic Transmission Filter Kits
You should change your filter every 20,000-30,000 miles in order to assure that your automatic transmission fluid is clean and free of debris. Always check your fluid level, as low fluids can cause catastrophic transmission failure. BMW's sometimes came with different transmissions, to check which model you have, refer to the manufacturers plate on the side of the transmission. Filter kits include new pan gasket and filter.
Automatic Transmission Filter Kits
09-2043-000-M30	Transmission Service Kit for ZF 3HP22 Transmission, 320i/is (04/77-83), Each Brand: Elring Klinger [More Info]	$12.50
Automatic Transmission Filters
24-31-1-201-102-BOE	Automatic Transmission Filter, ZF 3HP-22, 320i (1976-03/77), Each Brand: Genuine BMW [More Info]	$75.00
24-34-1-ZF-3-KIT	Automatic Transmission Filter, ZF 3HP-22, 320i/is (03/77-83), Each Brand: ZF [More Info]	$12.10
Driveshafts
The driveshaft is used to transmit the power from the transmission to the rear end, then from the rear end out to the wheels. While they rarely ever break, we here at Pelican can supply you with a rebuilt unit to get you back on the road. Please call for core charge information on our rebuilt driveshafts.

read it as well
and
of sure you are
free to belive it or not
!!
http://www.pelicanparts.com/BMW/catalog/shopcart/BE21/POR_BE21_TRANSM_pg1.htm