Thank you for the advice on used engine oil
I have done an experiment with 1qt. of new M. P. O. twenty hydraulic fluid
i broke into the fuel system before the PRefilter and let the engine run for ten minutes on a quart jar of hydraulic oil the engine ran fine except for when I got bubbles in the fuel system
it's smokes more than usual but not as much as other diesel engines. the only problem is hydraulic fluid smells really bad when it is burned.
I found one exhaust leak because of the extra smoke now I just need to fix that.
thanks again
Charles
1985 300 sd