Hi, i had some blue oily smelling smoke from my s2 erst a couple of months ago only at start up from cold, so i changed the turbo (it was a second hand one from a mate, hardly no play on the shaft!), and also brought a brand new Kent cvh 34 cam kit, and the smoke stopped!.

But the last 2 weeks it smokes on start up again not as much and not every day 3 times a week at the most, the engine has hit the 140k mileage now but still strong, i got 165 bhp and 190lbs of torque with just a chip and at 12 psi with no other mods in june so its not to bad for the mileage! any ideas for me to check, the cO2 is 3.5% think thats ok not sure though.