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I have a 99 7.3 that smokes blue on the first crank of the morning and after idling . Motor does have some blow by but not terrible. I see no oil in the fuel bowl . The turbo does have a little play . Is it possible that the turbo is passing oil ?
 

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I'm not sure how common worn valve stem seals are on a diesel engine, but if your truck was a gasser the symptoms point to that.

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Had the same problem with my 2000. Ended up being a bad bearing in the turbo. But a rebuild kit from prosource diesel and cured my issue. Hopefully this will help. Best of luck.

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