its like a vindaloo for engine gunk http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_185236_langId_-1_categoryId_165750#dtabbut if it was a tiny split rather than a hole, maybe full boost forces it out? just guessing mind
hhhmmm, fresh out of ideas then really, i guess its not throwing any codes?