Hello I will help you with your question,
Any shop with a flush machine can hookup to the oil cooler lines and flush your transmission.
To check the level follow the procedure below
To change the fluid by draining
Your fluid type is Total ATF H50235 or Esso LT71141 but a Quaker State or Penzoil Multi ATF will work in this transmission.
VW dealers have the spec oil at a fair price if you do not have a Suzuki dealer near
Let me know what I can do to help you with this
You are correct that the BG Synthetic #312 will work but Dexron 3 is not compatable with this transmission. At least that is what BG claims and they will carry the warranty on the fluid use.
Let me know what I can do to help
Glad to help, the filter is a screen that lists for $125
Let me know if there is anything I can do for you in the future
No there is no reason to change the screen.
Thanks again for using JA!