All the Toyotas I have ever owned have had a 14mm af head on the sump plug,
I don't know exactly how much oil it will take but my 2.0 litre Auris D4-D Turbo takes 6.5 litres of 5-40 fully synthetic oil so forget buying 4.5 litres from the service station it won't even make it onto the dipstick. Oil grade is important too so best check it out with Toyota so you get it right for the sake of your Turbo especially.
Hope this helps!
Steve.
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