My t4 transporter has done 60000 in three years and blown 2 stop lamp bulbs. The honest answer is I dont know, lots of bulbs last 10 years but the one's that are constantly heating up and cooling down go first i.e stop and indicator. If you think of a Vectra panel bulb that is on with the ign they still last 3 years at a couple of hour a day.
Now bulbs are made in the emerging economic nations a replacement bulb may not last long but OE bulbs last the longest and now charging systems are Engine ECU controlled and voltages allowed to go higher who knows
Barry
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