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Jaguar S-type diesel blowing blue smoke

My diesel Jaguar S-Type has started blowing blue smoke from underneath the front passenger side. The problem only happens in the cold, any idea what it is?

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That must be a pre-heater for the diesel fuel in the filter that only operates in cold weather.
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Proper, rear drive Jaguar, at its best as 3.0 V6 Sport manual.

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