Silly question. Your not touching the glass when you put them in are you? I was under the impression that the oils in your skin can contribute to premature failures of Halogen globes. Don't know why but have been told this 1/2 dozen times by auto sparkies.

Thumbs up for the turn off before shutting the car of and turn back on after starting.

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Stoner & Webber 2011 World Champions