Doing oil change, what size is the crush washer

[Jasper7821]

It seems Walmart is the place to buy oil, $22.88 for 5qt jug of Mobil 1 full synthetic and $7 for K&N filter. They don't list crush washer by name, only by size. What is the size needed for the drain plug?

Also, I'm in the burning AZ heat so going to use 0-40, and that's what's the prior owners used from looking at the Porsche dealer records.

Also, they have a really cool 15qt drain container for $10 that I saw on Amazon for $20