am i burning oil if...

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my blow-by was smoking a little today when i looked underneath.

 

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I would say no. I get vapor from there all the time. Higher blow-by doesn't always mean you're burning oil.
How much do you add between changes? Keep a good record of miles and oil added to see if your consumption increases.

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Lil' Mack - 89 D250LE 2WD 5 Spd 3. 54 Reg Cab. K&N,"tweaked pump", BD Injectors, Banks Pyro/Boost, 3. 5" Exst tail section straight. E&M Custom seats. Bosch H4, PIAA 80W/80W HdLites. 100W Drv,55W Fogs.
232,500 miles (372,000 Kms) 7700 Hrs. Cummins Power Booster member.
The Original Turbo Diesel

 

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well before my last oil change 2 weeks ago... i really saw almost no oil consumption
right before last oil change i consumed 1 quart @ 3500-4000 between changes
but so far my dipstick looks ok
yesterday what i neglected to mention was that it was cold enough to see my breath
so tomorrow i'm gonna check during the warm part of the day.
BTW i can smell the oil while idling for cooldown, right after a hard run on the highway 80mph.
thank you,
joe