i have just bought a ford focus ,its a v plate 1999 ,its got 88 k on the clock ive had it less than 2 weeks , its started burning oil ,, i got told from different garages thats its valve stem seals and possible piston rings , i dont think that it is , i changed the oil and oil filter , there is alot of white smoke at back end ,and alot of water , [Condensation] when you rev the car up , its ok on tickover , the temp is ok ,its not boiling ,its not losing power , if anybody can advise me on what to do next it would be appreciated thanks