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My 530d is also 'slow' to warm up. I've just noticed this thread and thought I'd reply.
I'll have to time it but its seems like about 15 minutes or so before its getting close to the 100 mark.
its always that way and I assumed this was quite normal for 2 reasons, one its a diesel and and such , because it is more efficient and doesn't waste energy as heat. Secondly my car has a oil temperature gauge as opposed to a coolant gauge in my previous E39 and assumed the oil just takes longer to get up to temperature.
This behaviour is consistent and I have no issues with the engine at all, its very economical and refined.
i never give it the bean unless the oil is at or very close to 100.
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