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Old 01-21-2009, 12:34 PM   #72
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Join Date: Nov 2007
Location: LSI
Posts: 397
My Ride: Z8
If you are using the correct coolant to water ratio coolant shouldn't freeze to begin with. Block heater is just to keep the motor oil in the engine block viscose so in cold weather oil lubricates instantaneously and their is no metal to metal grind. Keep in mind though most BMW approved oils claim to flow at their said SAE rating well between -35C (for Dealer 5w30 Castrol) to -47 C (for Mobil 1 0w40).

Regardless, I just didn't wanna take any chances + wanted to do this DIY especially because the dealer kept saying BMW's don't need block heaters LOL!
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