Getting ready to renew the cooling system in our 1998 528i.
New everything, the car only has 77,000 on it and feel the time is
right. The question I have concerns the small vent hole that a
number of forums advocate. One forum recommends a 1/16th inch
hole and another recommends a 1/8th inch hole be drilled in the
thermostat flange. Which size hole do you August gents recommend.
Cheers,


Patrick.