vinwert

Usually as a owner you need to keep a track when to change oil based on number of kms you have driven. And based on how many km oil you put while service. Usually oil comes for 3k, 5k or 10k km so next time while getting service you make a note of reading and remember after how many kms you need to change oil. Eppco guys must have seen oil color and condition and advise its not needed. They are pretty experienced so rely on them, its safe. When in doubt better to change as oil is very cheap here.

Show the heater lines to mechanic and he can advise you that how long job to restart the heater. All you know its minor disconnect of main heater core line to avoid water leakage in passenger seat, thats why previous owner disconnected it, its quite normal.

Yes it is but in prescribed quantity from coolant manufacturer. Usually OEM coolants are premixed you just need to put it just like that.

it may be true y dont u approach other spare part dealers they may have it in stock.

it looks like low suspension oil or harmonic balancer problem.

whats the price of the RC car? Is this audi or passat ? Just curious

you are correct it means Oil Change is required or oil is leaking

check the battery if it getting charged.

the pump must not be working.

There is no connection between the two things that i can think of but the smell can be of a bad air filter that should be changed.