Weird coolant “issue”

B8tdi

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Hey guys , i am new here but i was lurking some time before buying my Audi b8 2.0 tdi 125 kw version

so my car has small coolant loss, since I bought it in 3000 km i topped up maybe half liter of Antifreeze.
So now two strange things I have noticed after i topped up and some time after i went to check coolant and now on top of coolant reservoir coolant seems to be yellowish color and the rest of pink or puprle like it was before , i topped up with some store bought G12 that should go with audi , could the color change be because of i didnt top up with original g12 coolant ( I know when oil goes to coolant it becomes dirty brown.)

And yesterday I notices under my front bumper or under radiator on passenger side some drops of coolant ?

what can it be? Car runs nice and smooth and goes like mad, there is no white smoke from exhaust.
 

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Possible from leaking water pump or thermostat. Not sure where they are on the 2.0 engine, but have a look wherever they are.
 

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