blow by... with engine running either cold or hot take the oil cap.. loosen it and let it dance.. the more dancing the worse the blow by.. it also depends on if the engine is hot or cold..

the turbo.. if you can remove the U-tube and with the engine cold and off reach in and spin it.. does it spin freely? if so its good.. then check for shaft play ..check the coolant resevoir for coolant color and any oil floaring .. green colant bad.. mine has it i know bad.. but no oil.. service records etc etc

any other questions.. you know where to find me