2020 Land Rover Defender Oil and Filter Change (P400 petrol engine)

Vacuum extraction method.
Special tools and products needed:
OEM Tools 9.5L (2.5gal) fluid evacuator: www.amazon.com...
Pick the 9.5-liter model, as it will be barely big enough to vacuum all the oil from this engine in one shot.
Liqui Moly Special Tec LR (factory approved) 0W-20 motor oil: www.amazon.com...
Make sure the letters LR follow the Special Tec name! Liqui Moly manufactures a variety of Special Tec oils specific to other brands, but only Special Tec LR synthetic is approved by JLR for use on this engine. This is very important for any warranty claims (save your receipts!) If you are past the factory warranty period, a high quality synthetic of this same viscosity should be just fine and save you money, especially if your oil change intervals will be way shorter than the Land Rover recommended 21k miles or 2 years.
Oil filter is available from a variety of sources, such as Amazon, eBay, Land Rover dealers. As of this video, I could not find aftermarket alternatives to the OEM, but the filter is not a huge expense whether you go for the genuine article or not.