It's just general 75W transmission fluid in the gearbox. You can pick it up from Halfords. Use their online tool to input your registration to show which ones it recommends; - Click Here - The filler hole is on the right side of the engine block on top of the gearbox (down between the engine and the actuator/car battery.
Got a 2009 C4 Grand Picasso EGS. It was not going into reverse intermittently, other gears were fine. I would turn off car, then back on and that would usually resolve it, but then it got to a point where it wasn't going into reverse at all. Took it to Leicester dealership and they quoted me £1500 to change actuator!
The recommended transmission fluid for a Citroën Xsara Picasso with a manual transmission is 75W-80 synthetic gear oil. For a Citroën Xsara Picasso with an automatic transmission, the recommended fluid is Esso LT 71141. It is important to check the fluid level regularly and change the fluid at the intervals specified in the owner's manual.
The decision to change the oil is up to you. I changed mine at 55K miles, the gear change felt better after the oil was changed but the old full auto box has always been very good. Not sure about the new EAT6, perhaps it made no difference but I do feel it should be done. Hope that helps.
En moyenne le prix du changement de courroie de distribution est de 611 € sur une Citroën C4 Grand Picasso. Toutefois, le prix du changement de courroie de distribution sur une Citroën C4 Grand Picasso peut être très variable d'une version du modèle à l'autre. Nous vous conseillons donc de vérifier sur Vroomly quel est le meilleur prix
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citroen c4 grand picasso transmission oil change