I got my first Powerstroke on 4/29/14 w/ 287,300 miles. My daily driver. 99 7.3 crew cab dually 2WD with the Zf6. I put a clutch in it, glow plugs, EBP sensor. But thats it. It had black black black oil when I purchased it. But I just got around to changing it here on 6/6/14. I just randomly felt the need to check my oil today 6/22/14. Level is a "tad" bit above the MAX spot. (it was perfect last week) But I come to find its a DARK black/green, like forest green color. And EXTREMELY thin and bubbly. The truck runs perfect. Doesn't smoke, doesn't hesitate (that I know, it is my first powerstoke) performs well at high rev's and pulls 8,000 lbs without sweating. ALL Stock truck, NOTHING altered or modded. 290,500 miles as of today. I searched and found issues/threads similar. But nothing exact. Its got me stumped. It's my 59th vehicle (I buy/fix/resell in my spare time) and have never came across something exactly like this. I hope I'm not victim to block or pump cav. This was supposed to be my biggest flip, but I have a feeling it's going to be my biggest flop.

Help me out guys?

Thanks

 

I would say you have antifreeze going into the oil. Antifreeze most commonly used is green. I would STOP running it. This could be caused by a cracked head or cracked cylinder walls. I think they make a dye that you can drop into the antifreeze and then when it mixes. You should see it on the oil dip stick with a black light sort of thing.

 

Oh I know. That's what I figured. (the coolant part atleast) I just would like to know what's causing it. I've been running it like this for 4,000 miles (doesn't sound smart) but its my only vehicle. It runs perfect is the odd thing.