[casioqv]

How much oil does it burn? It sounds like you probably do have worn rings. Apparently the D24T turbo doesn't really lose oil itself when it gets older as there's no seal, there is a channel just outside the bearings that drains into the oil pan.

Some smokey vapor from the oil filler cap hole is normal even on a new engine, but it shouldn't be billowing hard, spraying oil out, or throwing the cap off if it's set in place without tightening at idle.