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My '96 K1100RS manual tells me it's 3.1 litres with no filter change, or 3.6 litres with a filter change. That's 6.5 US pints and 7.6 US pints respectively. Or 5.5 UK pints and 6.4 UK pints.
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!
Check your owners manual for the grade and type of oil. Probably a CD4 15W40. Make sure you use oil specifically designed for diesel engines...just any old oil will not work. Also, stick with one brand; each oil manufacture puts different additives which "flush" out of the engine when a different brand is used. It may take a couple of changes with the same brand, but you should see a decrease in oil comsumption.
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