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I've seen a block heater for m54: it looks a bit like an egg carton and "Legos" into the side of the block.
I only have seen about them never saw one for sale.
The best alternative would normally be a freeze plug heater but alas no freeze plug on m54.
Leaving the last alternative: inline heater that goes into I believe a heater hose. It has a pump and a heater and will pump the earned m warmed water though the block.
I've been wanting to get a heater for myself as well.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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