2ZR-FE is built to run an oil with a hot viscosity not more than 9cst at 100C (ideal being 7.5). going higher will severely hamper oil flow to parts like the VVT units (they are hydraulic and require a good volume to work smoothly)
The lower end also has very tight clearances due to this requirement. The ring pack on the pistons also have a lower viscosity requirement but a low activity oil to make it run clean - using a thicker oil results in the bearings getting starved because of low oil "volume"
similar thing happens at piston ring stack - the oil ring gets clogged with stagnant oil and burns,
our member haseeb has no proper yardstick. (as we have noticed with his posts) - he also thinks Pakistan has worse weather conditions than anywhere else on earth (and a few other planets too)
anyway - all engines burn a little oil. There is no engine on earth that doesnt burn some oil.