The only way is to suck all the oil from the system, to get it all you need to suck it out from the back of the engine, hopefully they are not just removing the oil fill cap and sucking it out of the oil tank. You also need to get it out of the crank case, so you will have to remove the cap from the back of the motor and tilt it on a angle and suck it out from their also. Email me at
glockm22@selectemail.net for owners manual.