I am a regular driver of the 2021 Yaris hybrid model without any particular knowledge in mechanics. The reason I bought it is because during the first service of my car, they put 0w-20 oil in the authorized service center instead of 0w-8 as explicitly stated in the vehicle's manual. It does mention that 0w-20 can be temporarily used, but it should be changed at the first opportunity. So that's what I did... Unfortunately, I couldn't find 0w-8 on Skroutz, so I ended up using 0w-16. I wish the dealerships would directly use it during the annual car maintenance service to save us unnecessary expenses, time, and hassle.

Edit: In the second annual service, I personally asked them to use 0w-8 and that's what they did. The cost was much higher (around 120 euros for just the oil) but what can we do...