I bet long idle times on top of that. How was the oil level?
You might have the injectors tested to see if you have one dumping
fuel. Also look and see what the fuel filter looks like. Is it red as in
off road red dyed fuel?
You could do the trick that Anthony showed once you have all the injectors
back in. Pressurize the fuel system and have the oil drain out and see
if you get any fuel leaking out into the drain pan.