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I would use a synthetic 5w30.... mild step up in viscosity for protection.
Toyota has had so many engine issues over the years that I have no faith in their best MPG 0w20 oil grade recommendation, or their 10k interval.
Sand storms? I'd worry more about the air filter. It will fill up with dust/sand quickly.
I would change the oil/filter every 5k miles since that dust sand environment is definitely severe service. Save the 10k interval for USA.
I would leave the coolant at 50:50... when you dilute the coolant too much, you also dilute the additive package which means you will have a short life coolant.
API/ILSAC SN/GF6 will reduce timing chain and associated hardware(tensioner/VVT/...) wear. After 30 years, the acronym oil gang will finally address a common wear and failure area of the thinner oils. We are still waiting for GF6... maybe in 2020!