Please explain everything correctly.
His Toyota warranty will also be void if he uses petrol from other petrol pumps. Only use Toyota petrol. As and when it is available.
Also, now Toyota 3S dealers have service stations as well. So his warranty will be void if he gets his car Axle Eye washed from road side.
His warranty will also be void if he replaces his cars tyres with any other brand than eurostar.
Driver also needs to be trained from Tota. Wait for driving classes to start.
Although his warranty will not be void, if he fills gutter water in his radiator. Also, if the dealership manager is his friend, then he can even replace parts from new cars even for no reason. No need to have any warranty.