20 Quarts of oil in the engine?!

[MacAaroni]

So just yesterday i changed my fathers oil in his 2008 Chevy Duramax 6.6 Lmm.. I had a 4.5gal drain pan and it ended up overfilling and i spilled oil everywhere. Had to get a small bucket to get the rest. Put the old oil back in gallon containers and measured 4.5 gallons (18 quarts) excluding the oil i spilled. What the hell just happened here? He told me the oil was changed about 4 months ago but i wanted to change it cause it was so black. Anyone know why on earth it would have almost double the amount of fluid in it?

[Z45]

fuel

[mjm-1957]

Injectors leaking fuel

[CamGTP]

Either they filled it up way too much or coolant/fuel is getting in the oil. Coolant would of course make a milkshake where as fuel won't.

 

Plus diesel engines always have black oil, never pulled a dipstick on a diesel that wasn't black when it's had a few miles driven on it.

[Z45]

Soot is a byproduct of incomplete combustion. Since soot particles are less than one micron in size,  the oil filter cannot filter them out. Most oil additives are up to 1 micron.

[riverbanks]

Who changed the oil last?a lube place,I've seen them overfill before,and forget to add oil,blew up a friend's car, Hyundai,made it almost home, about 20 miles with no oil

[4ws f 7]

Most likely the last oil change place forgot to drain the oil, scary part is it happens more than you think.