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Obviously the position of the car will help get as much of the oil out as possible. But I don't think you should worry too much because there will still be old oil throughout the engine. Its impossible to get 100% out. I don't think parallel to the ground is ideal either because the plug is towards the rear on the RHS. I used to worry about that kind of thing. These days my only concern is safety and to absolutely minimise the risk of anything going wrong while I am underneath.
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