Had the Bremen 90c thermostat installed. Added 3l of OE coolant concentrate and filled it to capacity with distilled water.

Just finished bleeding and engine is fully warmed up. Coolant OBC temp now sits at 95C from the previous 105-107C. Engine oil temp reads 83C on the OBC at this coolant temp.

The Bremen thermostat looks to be working as advertised.

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04 X5 3.0i auto
03 X5 4.6is