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Decided to view my engine temperature through the hidden menu! When I did it and started the car, it read 14*c, after 15mins it was at 50*c. Brought in for a 20mins spin (mixed driving) and it was up to 87*c! However, I noticed when I drove it again that as I was driving the temp kept dropping; it went from 87 to 63 in 5mins, when I stop the car at idle it climbed back up? Anyone know of this is normal or something faulty?
 

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Sounds like thermostats on the way out. Had a similar issue with my e46, these had the same engines as the first few production year e90's. Made a big improvement to mpg when i sorted them!
 

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Did ya get this sorted having the same problem myself only getting to about 78 max .

I believe there's 2 thermostats 1 on the egr cheap easy fix and one main stat .
 
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