my audi s3 was using water i did a compression test on it and they were low so started to take head off finding a cracked turbo and a cracked exhaust manifold once head was off pistons 2,3 were part washed piston 4 was fully washed so replaced every think head gasket turbo water pump manifold oil pick up pipe the lot spending 2k on it and now its using water but there are no obovious leaks any were replace header tank cap checked every were for leaks left it over night and there are no puddles in the moroning can any one help ?? cheers