Toyota Dezon 20W-50 is highly recommended for Massey Ferguson Tractor or Bedford truck. Are you driving one of these?
Their reason for promoting this oil is simple. They want you to visit their workshop as frequently as possible.
Meray Bhai, even Caltex Delo is a better oil. Fortuners manual recommends a 5W-30 oil. Just read it.
An engine which was introduced in 2016, deserves something better.