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Originally Posted by primetime
tonydan..that grinding noise may be your belts re-aligning.. Our cars do that when they've been sitting in the cold... Its most likely not related to your seperator... Mine makes a grinding start when on super cold days..I've had the seperator replaced and taken care of... That noise is my belts warming up and trying to align properly...It does that because of the cold temps outside. After a few seconds the noise goes away..Also the noise does not happen unless the car has been left in the cold and sitting for several hours...
Furthermore, let this be noted. Oil seperators can fail at any temperature. Summer or Winter. They seem to fail more often in the winter because conditions are more favorable for failure, but that doesn't mean they won't fail in the summer too. The part itself is not a lifetime part, it will fail after 70k miles or so..Its not a question of if, its a question of when... 
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i have just washed valve cover down with diesel fuel being diesel dosent harm the o-rings and or the plastic parts valve cover is now clean from all sludge and new gasket in place i am trying to find out what else i need . i have the intake removed,fuel raid disconected and i have the seperator out ,it is full of milky white oil . (seperator i will replace ) if i cleaned all the tubes that i have with deisel do i really need new ones . are they updated or something .or is it just playing it safe! does anyone have some pictures posted that i can look at what they changed .i understand changing the valve cover gasket and the oil seperator but if i clean the the other lines and they look clear and have no leaks , do i keep them? can some1 be really specific on parts that should be changed there is also a rail on the top of the intake that has some white oil in it, do i need that also or wil cleaning it with desil and shooting compressed air threw it be good . and last thing is there is a line that runs down towad the tranny that looks like it is also a little contaminated what do you do with this .