Originally Posted By: AlaskaMike
Originally Posted By: Ducked
Originally Posted By: mk378
That looks like it's been refilled with used oil.
Oil change on a big truck is typically two of those cans.
Could be, given the dirt, though from tilting the can, the content looks cleanish.
Be careful about that--if that barrel does contain used oil and sat for a couple months before you found it, the soot and other particulates will have settled out to a large degree. So you may very well have seen "cleanish" oil, even if it was used. If that's indeed the case, then the stuff towards the bottom will be black sludge.
This is obviously worth checking, but I'd be surprised if that were typical.
I kept a bottle of the residual oil from my second very short OCI sump removal on the current car (which had a lot of metal in the oil). It was, considering the oil only had a few hundred miles on it, very dark, but it never seemed to clear at all, and I'd be surprised if diesel soot was heavier.