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For the record, H7 bulbs do not have polarity. Aaand, oils will make it explode, not just burn out!
As for bad bulbs.. It could be loose parts or missing dampers. If there's too much vibration, the filaments will break! Or you may have just gotten unlucky with the bulb you bought. Did you replace your bulb prior to this? Or had the one prior to this been in there for a while?
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