yeah halogens are super fickly to oil and dust. In case you ever wondered here's why:
Halogens are under higher pressure and contain trace amounts typically of iodine which allows for redeposition of the tungsten back on the fillament. This allows them to be run at a higher temperature with out risk of premature failure. Because of this higher temperature and pressure, the glass on halogen bulbs is not the same as the glass on your incandescent bulbs. The higher temperature and the different glass are what cause the problem. When you touch the glass with your hands you deposit trance amount of oils on the glass. Now while off this is not a problem, but when turned on and up to operating temperatures these oils get baked INTO the glass, which weakens the glass. The same thing happens with dust. I have seen on some automotive
headlight bulbs (where the filament is close to the glass) the glass actually bubble. In other cases the glass gets so weak the bulb decides that it is happier inside out and *pop* there it goes.