Hi Canada calling

Can anyone throw some light on my problem? I have a 1991 Cossie 4x4 with only 113,000 kilometres genuine (no doubt) which burns more oil than it should. It seems it is worse under hard driving, no smoke to speak of but seems to consume 1 pint to 500kilometres, no oil leaks, engine in good original shape. I am thinking it may be breather system or PCV valve if it has one or could the turbo be losing it through the bearing but then I would see smoke. If I rev the engine quite high when stationary I get a small amount of blue smoke mixed with black but nothing that would give me this consumption.

Being in Canada I have no where to go with this one as no one knows what a cossie is