Most thermostats work the same. It's a simple and cheap system. The two wires will be for an engine sensor. It will most likely be for the water temperature gauge on the dashboard.
SOURCE: BMW 320i is using 5L of oil every 1000miles no
Try using an automotive dye in the oil the oil has to be going somewhere the dye should reveal the loose gasket or loose oil plug in which the leak may only occur at speed under pressure and not present when stopped
SOURCE: 1993 320i BMW Block heater
you can place your hand near you block heater on your oil pan and see if it is warm
SOURCE: I have a BMW 320i
If it is leaking, then it is not. Cars should not leak at all.
If it is being burned in the combustion process, some of that is normal — the older the engine, the more miles, the more so.
If it is burning a lot of oil, repairs are probably in order.
Oil can leak down the valve stems (which, if it is severe enough causes smoke on deceleration, due the the increased vacuum the intake valve stems undergo), or past the oil-scraper rings on the pistons (which, if severe enough, causes smoke an acceleration).
If this is not severe, switching to a slightly thicker oil can completely eliminate the problem. Don't go much higher than the recommended oil though, or you can introduce more serious problems.
SOURCE: please help on how to reset the Engine light for the BMW 320i E90,N46 engine
try to remove gnd battery cable then reinstall after bout 2 mins if code return you need scan tool
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