What's the oil capacity of a 6.7 Power Stroke diesel and which type is best?

The Ford 6.7-liter Power Stroke diesel engine is known for reliability and durability. What type of oil does it use, and how much do you need at each change?
SlashGear

Ford 7.3L Power Stroke Diesel V8 Vs. 6.7L Power Stroke V8: Which Engine Better Suits Your Needs?

When it comes to debating the best diesel engines ever put into pickup trucks, it doesn't take long for Ford Power Stroke models like the 7.3L and 6.7L (not to be confused with the 6.7L Cummins diesel ...
Jalopnik

6.4 Vs. 6.7 Power Stroke: How Do The Diesel Engines Compare?

The 6.4- and 6.7-liter Power Stroke turbo diesel engines are two different versions of the Ford Power Stroke engine, used to power Ford's big Super Duty trucks at various points. Both engines use high ...