Edit— Update: I just noticed that the coolant at the bottom of tank is pink and at the top its brown!!
Got this used Audi from someone (2nd Owner) here in Dubai, total Millage 146,000 KM and his wife did drive for only 26,000 km from 2020 to 2026 :D , from the last few months or maybe long not sure the car was idle, before selling he changed the battery same day.
What happened before? Then we get into Coolant issue.
After buying I had plan to change the oil early but after 1 day I got this Low Oil Level alert and checked the Oil level on MMI Display, it was at minimum, so I changed the Oil and oil filter
Then I thought to change the coolant as well , Coolant level was at minimum and after removing the cap, I heard some pressure sound and looked at coolent it was brown, then I looked under the Coolant tank, there was leakage from the coolant tank, it looked like oil but it was coming from coolant tank.
After 12 hours I opened the cap again, i heard the same pressure sound and the oily coolant was coming out again from back side under the coolant,
What I want to know?
1: Whats the most likely issue that is causing the Oil mix with coolant?
2: should I change the coolant tank or insert new coolant OR should I flush it completely and top new coolant and see if its gets mixed with Oil and also Check the coolant level?
3: why there was low level alrert of engine oil? Seller told me you can ride 4000 km morw but I changed early to be on safe side, while changing Engine Oil, there was no sign of leakage from the bottom of engine, maybe its from top or is it burning?
4: Fuel consumption is so high, should i change the spark plugs?
I dont want to spend on those things which are not needed, just want to make it good & ready to drive with better fuel consumption,
Sorry if am being nerd :D, help is needed from Audi Community - its my first Audi ever <3