gr8 buy brother regarding tyres. best decision.
yes for oil grade your understanding is correct. 5w-30 API SN fully synthetic is the oil you need. Our weather conditions are quite similar to middle east since we have summers for almost 8-9 months now.
as per my experience shell helix does not have fully synthetic API SN 5w-30 on offer so you can use Mobil, Kixx, Total 5w-30 API SN fully synthetic oil.
What is the recommended change interval in the car manual? in toyota there is a table usually oil and oil filter need changing at 5k Kms/6 months whichever comes first.
table also dictates inspection and replacement details for different filters and components in the car manual.
please also check such details.
drive safe. MA SHA ALLAH sweet ride.