S max 2.0 diesel

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Hi there. I have had an issue with our Ford s max 2.0 diesel year 2017. The oil cooler was replaced under warranty when I noticed that the coolant was gone black in the reservoir due to oil contamination.

However since the work was carried out the temperature gauge is somewhat erratic in its behaviour. It sometimes does not warm up at all. Other times it seems OK or may actually go down towards the cold side while actually driving. The dealer has thus far failed to rectify the issue. He's even telling me that the car is now out of warranty!!

Has anyone on here had any similar issues? It looks like I'll have to fix it myself. I was thinking of changing the thermostat as it may be clogged with oil deposits. I fear that it will cause further issues with the car if its not coming up to temperature. 

Regards Joseph. 

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