WD40 is petroleum based, so rots rubber and is also inflammable.
While I still have a can or two, my preference is also silicon spray. The
cheapest way to buy it is to look for "Silicon Mold Release Agent". Basically,
silicon grease in an aerosol.. Fixes the old style distributor caps for good and
also prevents electrolytic corrosion in multipin auto connectors...
Thanks for the info, syseng. (Pedant alert: I know you mean flammable). I have sprayed WD40 all over the car engine bay for the last couple of winters and the results are great. The rubber looks new and shows no sign of perishing. Or am I suddenly going to be stranded by the roadside one night?
I have always wondered how spraying silicon etc onto electrical connections makes them work. Apart from driving off water, one would expect it to cause bad connections by it's insulating properties? (and I speak as an erstwhile electronics engineer).