hi to all, after owning a few BMW's with the straight 6 engine, i have noticed my 04 plate 3.0 z4 warms up very quickly....the needle is off the blue after a few minutes of running. ....where as my "older" cars never got upto full temperature after a 5 mile commute to work. i understand how the thermostat works, but is there another system on my engine, i seem to recall something about this fitted to SAAB cars???