Trying to establish oil I need for the easytronic S A I'm guessing Dot 4, and assume it's the little housing to lower right of the engine , I plan to pump.out what I can and do a few partial changes , as its looking very dark.

2006 1.6 petrol Meriva Easytronic S.A

am I correct  it's just by /below brake hydraulic unit

Dot 4 

Edited January 21Jan 21 by jonbrighton
Attach photo

Here is the correct fluid for the Easytronic transmission

https://www.ebay.co.uk/itm/273902881945?_skw=Easytronic+fluid&epid=8032645257&itmmeta=01JJP6NQHEJSKWFDYZBPW8JFK2&hash=item3fc5e24c99:g:EUsAAOSweY9maFMz&itmprp=enc%3AAQAJAAAA0HoV3kP08IDx%2BKZ9MfhVJKlWqFaBEvDBkvRhCp0QezZbFyp8GKXP2RgqTZxSIA14P8fe2ONrMgAw7OL77%2BnSnXvZpfsIvF5c99GPcoIXi9wvlBccaxSPicDnYGEZ3eOK8kE9A4tQyODMpzkNJgtLhNOLLoIrm9Ac%2FbP1GCfPyY8sWiyqGfgZ8Ir8rFI8ukGiPTLY%2F%2BhoFCsWHs3OTLA%2FApzvjajK3DDzb%2BqP%2BZ5LVHtN%2FAEZX%2FG2ow6p%2Bc99xTZMHK8NnEnHSppWIGBMyCA7hwU%3D|tkp%3ABk9SR_D41saVZQ

On a Vauxhall with an Easytronic transmission, the transmission fluid reservoir is typically located on the top of the transmission housing, near the rear of the engine bay; it will usually have a small fill cap that you can access to check and add fluid, though the exact location might vary slightly depending on the specific Vauxhall model - always consult your vehicle's owner's manual for the most accurate location

Some more information that I have found

Hydraulic fluid

Also checking and replacing (when needed) the hydraulic fluid is no unnecessary luxury. Many cases are known where the system has not had maintenance for years and where flushing and bleeding solved the problem. Flushing and bleeding the hydraulic circuit has even more advantages: possible defects with the clutch actuator (see below for more information) are easy to be detected. The bleeding-procedure is so detailed, that during controlling the clutch actuator, defects easily become visible. Often the actuator is (partly) defective.

Regular maintenance

The effect of inadequate maintenance of the car is very underestimated. The controlling of the clutch is hydraulic and receives its fluid from the brake fluid reservoir. When the brake fluid is contaminated, it doesn’t just affect the brake system but also the clutch system (and therefore also the clutch actuator). Especially oil seals don’t like this contamination.

Information source: https://www.actronics.co.uk/acinsights/bosch-easytronic-f13-mta-f17-mta