I have a turbo astra cabrio for 1 month now and yesterday I noticed when it was idling a lot of blue smoke coming out of the exhaust. After I stopped it ans started it 10 mins later the smoke was gone. I drove it home and still no smoke. Today when I left home still no smoke, I parked it and when i came back and started it again a lot of blue smoke. I drove it around and the smoke kept coming out mostly when standing still. I stopped it again, and checked the intake hose for oil and it was normal (very little oil on the inside of the hose). I started it in 5 mins and no smoke... I left it running and after about 5 mins idling it started smoking a light white/bluish smoke. I pressed the throtle and a cloud of blue smoke came out. I stopped it again, started it later and no smoke (even if I was hammering it). I drove it home and still no smoke.
I asked a friend mechanic and he said it was the seals of the valves. He said if it was the turbo, the smoke would have come out every time and especially a lot more when using the turbo.
What can I check/do to figure out what`s the problem so I can fix it.
Note : I have Aral 0W-40 Oil in it and I add about 1L in 2000 Km (after "check oil level" message).