Opened the bonnet, looked to LHS beyond screen-wash reservoir, removed cap on (?) hydraulic oil, found it to be RED in colour and below minimum level when engine not running.

Went to shop: insisted I buy hydraulic oil for manual - GREENish in colour! Panicked. Went to another shop: bought hydraulic oil for automatic - RED in colour.


  1. Can I mix manual and automatic hydraulic oil?

  2. Low/dry reservoir - does it greatly damage clutch?

  • To clarify, you are trying to top off the master cylinder on your clutch reservoir? What year is your Citroen Berlingo? Engine (which diesel)? Miles? Commented Mar 12, 2016 at 13:35
  • I am asking about the small reservoir immediately behind the screen wash reservoir. This is not the main engine oil reservoir (tested by the dip-stick). The reservoir in question is tested by looking to see if the level is above minimum. My diesel Citreon is 1.9. Year 2001. Can I mix red and green "hydraulic" oil? Why am I pressurised to use "automatic" oil for my manual gear change?
    – clint mede
    Commented Mar 17, 2016 at 16:13

2 Answers 2


It sounds like you opened the power steering reservoir. If so, these usually use the same red dexron fluid as automatic transmissions.

Usually there is a symbol on the cap to identify it. Quite often the power steering has a steering wheel symbol. You really need to know exactly what to put in before you add anything.

  • cap - hmm, my friend lost the capwhen he was topping up at a service station. I'veput a temporary cap on until I can get a proper replacement.
    – clint mede
    Commented Mar 20, 2016 at 16:01
  • does this resrvoir have a filter with the (missing) cap?
    – clint mede
    Commented Mar 20, 2016 at 16:02
  • is the clutch damage - I had to replace clutch because couldn't change gears - related to the low level in this reservoir (or is it a coincidence)?
    – clint mede
    Commented Mar 20, 2016 at 16:03

Look in the owners manual (if you don't have it, check online there may be a PDF version available). That should both tell you what the various reservoirs are for and what is supposed to go in them.

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