Coolant/anti freeze

[S9aln]

Hi all , my wife just got a 2017 ds3 1.2 130 pure tech
last week , the coolant seems to be a lager / light brown colour when I take a sample from the header tank . Is this normal ? I have no bubbles in tank or no emulsified
oil and no lack of performance so I don’t suspect hg failure . Just wondered if this is a normal colour and nothing to investigate under warranty .

[Chris_Blue]

Coolant needs replacing every 4 years

Mines a mud colour too, but just topped up with Prestone until I do a full change