You may have a bad injector/s leaking diesel past your pistons and mixing with your crank case oil...... pull the dipstick and "sniff" it.... you will smell the diesel.
Ten quarts
putting too much oil in any engine is not good... the oil can over flow to your spark plug... that can cause stall..
10 us qts.
Over filling engine oil can cause catayltic converter.
not much. it would change the viscosity of the oil. the diesel oil is much thicker than regular engine oil.
Too much oil in the pan. Broken piston rings. Bad turbo bearing seals.
5
check the level with the oil dipstick. cross hatched section indicates the correct amount of oil. lower mark means 1 qt low, so anywhere within the cross hatching is good. if you have too much the oil will be over the upper mark.
A lot
60%
6 quarts
5 qts.