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If you are cleaning it off, reinserting, and it comes out clean... I would add some oil and check again. Add a half quart, recheck and see if the level reaches the dipstick. If not, add another half, and recheck again. Repeat until you see oil on the dipstick.
Not a bad idea to replace the turbo oil line with a Detroit Tuned Super Kit. And while you have it apart for that it is easier to replace the "O" ring gasket in the oil filter base. This kit comes with everything you need (except labor) to do both jobs.