Disco 2 Slight water loss

Hi All
I hope you are all fine!
Today I discovered a slight water loss which was never before. I had to refill about 2dl to recover water level in reservoir tank.
I do not see any leak, broken hose or connection. I suspect that it comes from the tank overflow pipe as I see water marks on the frame under it.
As I have said I had never any water loss before, but in the last two-three weeks I have had some off roading (did not really done before), nothing serious just with the children and dog, but on low speed (1st or 2nd gear max).
Any idea what should I start checking?

Hi, i'd replace the tank's cap with a new one first to be ruled out, it's quite common for the pressure control valve to fail in them and create overpressure, get genuine BMW cap cos it fits and it's cheaper than LR, part number 17111719167... and tighten it as much as possible

sierrafery said:

Hi, i'd replace the tank's cap with a new one first to be ruled out, it's quite common for the pressure control valve to fail in them and create overpressure, get genuine BMW cap cos it fits and it's cheaper than LR, part number 17111719167... and tighten it as much as possible

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Ok thanks, I will try.
Regarding on the given P/N (17111719167) it lists a lot of different make from cheap to expensive but I could not see genuine BMW...
I guess Mahle or Gates could be fine...

berg450 said:

I guess Mahle or Gates could be fine...

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Yes