The thicker the oil is at this temp, the higher its rating will be. Thus, 0W30 motor oil would be less resistant to high temperatures than 0W40 oil, for example. 0W30 would become watery at lower temperatures than 0W40 motor oil, while the latter would be able to stay viscous enough ...
Now time for the confusing bit: charging speeds. All wireless charging-capable phones support 5W charging. It's the standard, but it's pretty slow. Unfortunately, faster charging on Android is a mess. Most manufacturers use their own proprietary "standard" to charge faster. That's why you'l...