Just a film. Not a lot. This is my first diesel so this is all new to me. Had a 96 gmc 1500 that I knew inside and out, loved that truck. Went to change my ball joint on the 250 and fell into a whole different world. I'm having to almost relearn everything.
film is normal you will see the Crank Case Ventilation tube comes from the valvecover to the intake and some light misting or oil drawn into the intake tube will leave that film. You can get rid of that if you want with the CCV mod but if you live in a climate where freezing can happen be carefull where you vent to and how the tube runs. Some moisture also runs with the mist and the moisture can collect and freeze causing the excess pressure to blow a seal somewhere, could be an important one that costs alot of money to repair, i just left mine alone and never had an issue up here in Canada.
no problem, just remember that water vaper escapes with this slight oily film and if you are not carefull how you route the drain hose/pipe and leave an area that allows the water to form a trap and seal off this tube, then yes it will be a problem. drain correctly and no problems at all.
I would leave it be, ccv mod done wrong blows oil out of everywhere, done the usual way stinks, smokes and pollutes. Done the right way can be expensive if purchased.
Not to mention you gain little or nothing from it.
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