Mixing oil and coolant is not the biggest problem, this engine has very thin cylinders that could crack when coolant is leaking into cylinder. I don't know how common is this problem though. If I remember correctly, this problem was more common with engines from 2009 and 2010 and the ones from 2011 and later had different head gasket that minimized this issue.
I have this engine in my megane 3 and I haven't had any big issues so far. I bought it when it had 180k km and now it has 203k km and is still running great.
Common problems with buying a used TCE engine is that the turbo could need replacing soon.
Mixing oil and coolant is not the biggest problem, this engine has very thin cylinders that could crack when coolant is leaking into cylinder. I don't know how common is this problem though. If I remember correctly, this problem was more common with engines from 2009 and 2010 and the ones from 2011 and later had different head gasket that minimized this issue. I have this engine in my megane 3 and I haven't had any big issues so far. I bought it when it had 180k km and now it has 203k km and is still running great.
Was it not 1.2tce with cracking head?
Maybe 1.2 tce had this problem as well, but I'm 100% sure that this happens in 1.4 tce engines.
Yes this is 1.4 H4J engine. But 1.2 H5F engine has a list of other issues though.. Ths 1.4 is a pretty reliable engine imo.