Another opinion is - - - Go to a boat store and get an oil changer.It's an electic pump on top of a 14 quart pail with a cover. With the oil hot, stick the small hose down the dip stick tube and suck out the old oil.Pour in the new oil(after changing the Filter). Then stick the hose into each used oil container,reverse the switch and pump the used oil into the containers, put the caps on and take the used oil to a recycling center. I learned to park my SDL on a slight slope with the front of the car lower so the oil runs to the front of the engine where the dip stick tube is. My SDL oil looks clean for about 50 miles. I use Rotella T and change every 3000 miles. I'm too cheap to buy syn oil.
(I also use this method on my diesel boat motors)