Hello , I know that this is a common question, recently I used Liqui Moly special tec aa 5w30 in my Corolla 2019 le engine that in the car manual specified with 0w20 or 5w20, the reason for doing this because I have five liters of Liqui Moly in my garage, but what surprised me that the same engine and car in Australia 5w30 or even 10w30 is recommende, I live in very hot climate in summer +120 F , and in winter the average temp is about 50 F , so am I harming my engine by using 5w30 or it is fine according to such climate, opinions please!