Our 1994 XJ 40 4.0L (86K on the clock and bought one year ago) has had the characteristic smoke cloud (valve stem oil seals relarted) but over the last year this has reduced dramatically. The cars history includes
7 years with only 17K miles inc one year with only 600 miles. Since we bought it (one year ago) I have given it a real thrashing at least once a day and the car loves it, the engine loves it and I have to say I do too. It would appear that the 10K miles in the last year inc motorway work has done the engine the world of good. However, I have heard rumours that there may be an oil additive that will help re-soften the oil seals and therefore attenuate the (now) slight blue "puff". I am currently of the belief that the only cure is a cylinder head revamp but am open to suggestions. In my experience, once you take an engine apart in any way it is never the same again. Does anyone know about any truth in this rumour?- posted
18 years ago