Changing the oil is a must do
BUT it is highly recommended to change it
before going into storage lock down. Old oil starts to go acidic or whatever after standing long periods,
so I am told. Also,
synthetic oil is again the preferred choice over regular 5/30. I have also been told by the same MB indy that there is nothing gained by turning the motor over at starter speed before firing up as the oil pump does not reach required pressure for full circulation? Is there anyone out there who disagrees with this?