Hey guys had my car for over a month now loving it and clocked around 3500ks already. Only worries is that the overflow tank has a strange smell and a slight oily-brown tinge to it. After driving it a little hard and popping the overflow tank cap the coolant can be seen bubbling. The car doesn't leak from anywhere or overheat, no smoke or residue in the exhaust. Doesn't seem to be any oil in water or vice versa and runs real well.
Also note i took it for a 40min drive on a real nice windy gravel road (old mountain road out near raglan if anyone is familiar) sliding through the corners etc and afterwards it had spat out about 500ml of coolant out the overflow. It was doing it excessively when i re-installed the restrictor pill after driving on boost but that was fixed when i replaced the rad cap with a new one. Will be taking it for a leakdown test this week hopefully.
Because of the smell has got me thinking my head gaskets might be leaking, dont have the cash to shell out for a 2.5k job or whatver it may be and dont have the tools or knowledge to do it at home. Thoughts?
also car has done 148000Ks (not miles)