The volumetric expansion of engine oil is about zero so does not come into the reckoning at all. My 117 engined 500SEL V8 holds about 8 quarts and the difference between the upper and lower red min and max mark is about a quart. I seem to remember reading in the service CD set, a bulletin that suggests you do not run at the full mark but rather drop it about 1/2 quart to the mid way area. Over servicing is as bad as underservicing and I will always check the level cold, usually in the morning when it has had a chance to drain back into the sump.