Hate to say it but when I had the same problem it turned out to be piston rings, had good equal compression but had a sickly burnt oil smell and smoked a little. Not trying to worry you hopefully turns out to be a blocked breather or something simple.  Have you actually taken of the exhaust downpipe or intercooler pipe to see if there's any oil laying in there or around the turbine blades? You don't need alot of oil to leak to notice it when it burns.