ive just been driving my clio 16v and i noticed the oil pressure is at 0 when im idling and only moves up slightly when moving. ive also got water problems,needing topping up regularaly. i know this is not normal, but dont really know wot it is. could it be the head gasket? does anyone know wot sort of prices it gonna be, cause i dont wanna get ripped off,as i aint got much money.