could be head gasket but if water level not dropping this is unlikley if not overheating this is another indicator of no prob does ithave a stainless steel exhaust system if so it will eject more water than a normal exhuast, so if it runs normally does not overheat and does not use water it is probably ok, last thing just dip the oil and see if looks like mayonaise if not it seems ok
stuart
April 2010