I have 7.3 with 220k and the last couple of oil changes I have noticed that my oil has a green tint, I use rotella 15-40 and I only drive about 200 miles a month. I thought maybe it was cause it sat so much and cause I leave it plugged in quite a bit as I live in North Dakota winters. I do t have oil going up or losing antifreeze anybody have a idea of why it turns green. Possibly the rotella? Possibly injector issues( no loss of power or issues with starting)

 

The only thing that I can think of that is green could be the a/c oil. But how it's getting In the oil is a mystery to me.

 

Could the oil itself be breaking down

 

thats very possible

 

I am gonna try and put motorcraft oil in it and see if that does anything

 

Is the coolant discolored in the radiator tank?

 

No I had it flushed the other day and all was good, besides I had to return it to shop because they broke sediments and rust free and it was floating around in the overflow, they seem to think it's green because I drive short trips in it and not getting all the moisture out. I live in north dakota and weather can go -40 to 60 above in a matter of days