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Are any of your trucks using oil? I just got mine changed 1500 miles ago and its about an 1/8 inch from being in the add... Is that normal for these engines or is there something I should be looking at? I checked the plenum and that looks okay...
Could be caused by blow by and it's vaporizing the oil. Check out this thread I did. It's not exactly what your talking about but the same rules apply: