If the suction method is used it is very important to ensure that too much new oil is not added while assuming that most or all the oil was sucked out.
It is my understanding that a owner experenced major engine damage by putting too much oil into the engine after a suck-out procedure that did not extract all the oil. It may be good to measure the extracted amount.
96 C280 Mercedes
82 Rolls Royce Silver Spur