burning oil

[silver91.5]

i got a 91.5 w250 runs great but burns oil bad i drove it 500 miles this week and it used 2.5-3 quarts of oil not leaking burning. truck runs perfect been getting 20-22mpg its bone stock just has the smoke screw turned in where do i start to find the problem? any help would be great as this is my first diesel and i dont know much about them

[oldestof11]

How bad is the blow-by? Any?

If not, I would think the blow-by tube is clogged, and the crank case pressure is blowing oil past the rings.

Any blue, burning oil smell?

[Richie O]

Turbo seal gone maybe.

[peobryant]

Turbo seal gone maybe.

That would cause bluish tinted smoke, correct?

[Greenleaf]

my 90 with 320+ thousand does not burn any oil of which I have noticed. You likley have something wrong other than wear and tear. I have not touched the valve stem seals either. No blow by to speak of.