old car oil

[Binnie]

only if you intend bathing them in it for a few years. otherwise i'd be riddled with cancer by now if short term contact was severely hazardous to health.


I dunno what the flash point of oil engine oil is, you could do the old boiling oil out the window and lighter trick?

on a security based note, you could mix it with a little grease and paint it on drain pipes etc, no one is gonna be able to climb up that slippery mess!