Is the engine using oil?

When you idle the engine, the water in the exhaust gas will often start to condense in the pipe where it will dissolve soot which is then blown out of the end of the tail pipe. You might be worrying about nothing!

I did have a problem with the exhaust a while ago, there was a bit of a blockage, but after having rods put through this seemed to have fixed that particular problem.

Erm? Exhaust pipes don't become blocked! If the baffles in the silencer collapsed you need a new silencer, not dynorod.

Edited by unthrottled on 08/06/2011 at 21:07

Do you rev the engine hard when it's still cold? Your oil control rings could be on their way out if it's drinking that much oil and showing no smoke/leaks and you can still run it ok.

Have you checked the head Gasket??

Take the oil filler cap off and check it for a creamy substance and check the expansion tank for the same.

I am sure you have hecked but, 4 liters of oil is going somewhere and if you havn't got plumes of black smoke or a pool of oil under the car then my only thoughts are that it's still there..probably in the coolant.