Critters as in the 4 legged variety (mice and chipmunks). I use the same oil that is used in candy making it is pretty strong and lasts all winter and as an added bonus the car smells better than moth balls. For comparison our daily driver x3 is parked right next to the Z and I am constantly cleaning acorns and nesting material out of the front shock towers. So I have to believe that the oil is working.
2008 Z4 3.0si Sport Package, Premium package, heated seats, M sport seats, xenon headlights
2002 325 xi, sport handling, rosewood trim
2005 X3 Premium package