FYI: toyota indus motors pakistan recommends 5w50 viscosity for 2zrfe engine in Pakistan. Toyota Japan recommends 5w30 in Japan. I know people who have driven their 2011 altis 1.6 upto 400,000kms and 350,000kms on mobil 1 5w50, and even their cars doesn’t reduce oil at such mileage. It still gives them optimal acceleration and fuel economy. If second figure have that much impact on engine according to your logic than my engine will be doomed in few kms. I’m happy with my choice coz it’s my car, and I have used 5-6 different oils in my car in 60k kms. Among all of them I would rate Mobil 1 the best among all. You might have read on internet that 5w30 is good for this engine, but our enviornment have pollution, dust and bad fuel quality. People who recommended lighter viscosity oils wasn’t testing cars in Pakistan,
IMC had that responsibility.