My car is Suzuki alto japan 2017. According to the owner's manual, car manufacturer recommends 0w-20 or 5W-30 engine oil. But the previous owner has used 10w-30 oil. Since I live in Colombo, does it matter if I use 10W or 5W? I have read that less viscous oil tend to break under high temperatures. Which oil is better for the engine life w-20 or w-30?