Maybe yet another resevoir replacement, they can be very tempremental. I replaced mine twice before it stopped loosing coolant.

Col
 
Payen BW750 is out of production however autodoc has them in stock I've ordered two :)
That oem-q is hit and miss, is an alleged copy of bw750, mostly are ok but some not so much. I've had very bad experiences with melted cats because of the "oem" coils that DMGS sold.
 

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