Hi Have aJ aguar X type 05 Plate 2 litre Diesel, Oil leak coming from drivers side of the engine and ideas? Cheers Mark

What is your oil level on the dipstick ?

Would recommend to steam clean complete engine compartment, to include the bottom.

Next, top your fluids and place clean towels or rags. Start your car until leak is present. With flash light Che k where from. If fluid is redesh in color, it's transmission fluid. If it's dark brown or black, engine oil.

Check bottom of oil and transmission pans for possible cracks or damage.

You put compressed air into the cylinder an listen for the air escaping , if coming out of the throttle plate ,burnt intake valve . If you hear air coming out of exhaust pipe , burnt exhaust valve . If you hear air coming out dip stick tube bad rings or piston damage. How To Perform Leak Down Test EricTheCarGuy

because engine have no lights

I am not familiar with the 407 but I would think it is a HDi, if so what you describe is an air leak from a pipe from the pressure side of the turbo, I have had this on a Saab, in that case there was an over pressure switch under the dash and the pipe fell off. Look at the top of the engine, on the inlet side there will be a pipe from the inlet trunking or manifold, it should (maybe with a tee piece in there) go through the bulkhead

Mazda say that if your Mazda 6 consumues less than a litre every 900 miles then it within tolerance.
However these cars have a complicated induction mechanism controld by lots of diffrent vacume pots that are inturn controlled by servos, when any one of these becomes faulty the pressure balance between the exhaust side of the turbo and the inlet side becomes inbalanced, resulting in oil being forced through the turbos bearings. Its that simple lol!
The first thing I would check would be the swirl control valve, In the inlet manifold, This gets fouled up by the exhaust gases getting recycled by the egr valve(exhaust gas recycler)
Sooty deposits mix with oil coming from your turbo and jam it closed restricting the amount of air into the engine, and reducing power as well as creating black smoke from your exhaust.
So my advice would be to get your egr valve proffetionally blanked off, and have your induction system checked over.
Hope this helps as I am sure this is a very common problem!

I expect that you have an oil leak that is dripping/running on to the exhaust. The burnt oil will smells a bit like rubber. Check for oil leaks that are higher up on the engine. (Valve Cover gasket for example).

Hi I have the same problem on my 07 plate 2.2 litre diesel x type - oli seal needs to be replaced behind timing cover - the part is cheap at about 16 pound but the labour is horrendous at around 450 because of the need to dismantle so much to get the cover off...

Yes this can be done in place,remove timing belt side engine mounting,lower rear engine mount and front mount and engine can be moved over to leave room to get the plate bolts out that is in front of the timing cover,its awkward but can be done.