I agree with Ben.
Problems only arise when used inappropriately, such as on cooling systems, or carburettors; or when far too much is used on the joint and the excess can squeeze into the lubricating system for example.
It is also important that household silicon sealants - the type that smell of vinegar - are not suitable for automotive use due to their corrosive action on aluminium and incompatibility with sensors,
Cheers Charlie

