Quote:
Originally Posted by bobdabuilda
Sounds like a little physics experiment is in order with a new thermostat, a bain marie and a thermometer. I did this once with an audi a4 thermostat that was also marked 90 degrees but was only fully open at that temp and began opening at around 85.
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Hi
I had a wee search around the web and it seems that the stamped temperature on a themostat is the temperature that its fully open, NOT the temperature that it starts to open.
Having replaced the engine and EGR (yes, EGR - its water cooled) thermostats on my BMW E60 - the economy of the car has increased considerably (8-12MPG)! Seems that modern diesels are not fuel efficient unless circa 82-92 degrees.
David