hi mateit sounds like valve stem oil seals ive just overhauled my engine it had the double chain on the bottom and i single up top but you can upgrade to the double and it cost a grand from TPS to do the full monty plus £250 to get the head done and done all the labour with a couple of other members VW wanted £1000 just for chains and head gasket but like others say its not worth skimping on these parts and it will be good for another hundred thou