Just for the need of an empty container you dont want to dump the oil in the engine over its capacity. Its ok if oil level is a bit low but its not ok if oil is a bit high. Excess oil in the engine causes more damage to the engine than less oil. Its a total misconception that filling a couple of 100ml oil is good for engine.
There were few debates on oil grades on AFF before but the fact is there is a reason behind an oil recommendation. When engine is cold started thin oil gets easily into cams, all thin and narrow places easily reducing friction and wear and tear and being fully synthetic it wont break down at high temps. No matter how good the oil is synthetic oil can not be replaced with ordinary oil. Non synthetic oil breaks down easily at high temps. I always go with the recommendation and using a grade above wont kill engine instantly or shortens engine life drastically. It depends how you use the car, right next to freeway and you start your car and jump on to freeway instantly every morning then yes it does make lot of difference with oil viscosity. Again end of the day its your choice.
There are many ways of doing things as long as you know what you are doing. Sticking screw driver is not advised with all filters. If a filter has thick deep thread inside then you might damage the it. And if you strip filter using screw driver and filter is still jammed in then you just made your job complicated. Use correct wrench or tools, metal expands when hot and makes it hard so let it cool down a bit.
Draining oil overnight would make your engine absolute dry and next time when you fill oil and start, it takes a while before oil reaches all parts of engine and until then its metal on metal. When an engine is rebuilt all parts are lubed before assembled to minimise the wear and tear in the first start. Instead of draining overnight do the next oil change before schedule. Same applies with engine flush. If engine is too dirty and you flush it then you are actually cleaning the deposits on the oil rings and then oil starts to get through the rings.
Am just sharing my knowledge and opinion being a qualified mechanic. No offence guys. cheers
Yogi
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Ex Cougar - 00' MTX 2.5L (Limited edition Eibach Cougar); Dark Green Tourmaline; Lowered with Eibach tuned suspension from factory; SVT UIM, LIM & Throttle body; Supercat 2.5" dual exhaust with twin pipe quad outlets; Custom headers; Custom coloured instrument cluster; K&N Apollo CAI kit; Calibre oil catch can.
Now driving a Lexus RX 450h. Your guess is correct that I am a family man now. 
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