Oh, I get it now.. It's a matter of conductivity.. Rubber is carbon based, carbon conducts electricity, to a degree. I heard of this when taking classes from Goodyear back in my parts counter days. You have more problems with the heat and oil than the RF thing.. You should ALWAYS change the hoses and belts on a regular basis. Even with the silicone, you may get more time from them but, you NEVER want to chance it.