If you drive it around and want to start it in the winter, you may fin that in extreme cold (and that can be 10-15F) the diesel will fill with wax crystals and clog up the fuel lines and filter. In cold weather, add Power Service White Bottle (available at every Wal Mart) to your fuel. It prevents gelling and increases cetane rating making it easier to start.
2019 VW Passat 2.0 liter gasoline DI engine, DI, 2,700 miles, Castrol Professional VW 508 0W-20
2017 VW Golf All Track 1.8 liter gas engine DI, 25,500 miles Castrol Professional VW 505 5W-40