Those 20l kegs are the correctly sized "dream buy". I wish we had 'em here.
However, the OP is doing his first drain & fill and <4l will drain so a 4, 5 or 6-pack purchase is OK. Likely he will need additional drain & fills but we don't know how he'll react to the experience of doing this job.
Even though a drain & fill is quite easy, many find under-car tasks horrid (or have a bad experience like spilling) and will never do it again.
Remember OP, you don't want a small plastic basin suitable for washing a new born kitten. You need a larger plastic pan; one with a pouring spout.
Also, do not buy one of those odd drain jugs where you let the draining fluid into the side of the jug-then stand it up like a suitcase.
They splash to no end and the big, screw in plastic disc (which seals the open side) are complete garbage.
Decide for yourself. Skip the shipping and reduce the drama and get your first d&f done with a 4l purchase. If the fluid is black and bad (likely) then your subsequent drain & fills will eat up the keg.
Don't saddle a first timer with a 20l keg.
I've gone through many 12-qt. cases and >20 gallon jugs of several ATFs and am very glad I no longer warehouse the stuff.
Companies here sell appropriately sized kits for drain & fills. It's what I now use on my Volvo and won't need for another 20,000+ miles.
Today I've one, sealed 6 quart case of MerconV for my truck and 4 qts. of Mazda FZ for the Mrs' CX-5.
I'm getting older and the thought of my widow giving my ATF stash away or selling it to some scraggly, opportunistic piece of $#!* for pennies on the dollar irks me.
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