They will both come on when I first start the car, but as soon as I use the switch either way, the left one goes out. If I shut off and restart, all is well again.

I am assuming original stock bulbs. I just got the car last February. Thanks for the replacement bulb info.

I don't use my fog lights unless it's foggy. It annoys me when others do it, so I don't.

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1978 E21 320i 1980-99
1985 E28 533i 1999-2001
2006 E53 X5 4.4i Build Date 6/06 2012-