Dear Scotty

i do have Toyota Vitz 2012 model and about 15 days back I have change head assembly because of oil consumption problem kindly guide me what oil grade shall I use as currently I am using 5w30 liqui moly TecAA. I don’t have any idea about mileage of engine. Also today I have gone through smoke test which car engine seems fine no smoke after removing oxygen sensor. Pick up is good no abnormal vibration but little vibration is normal as many people have same car claim because it’s a 3 cylinder car. At morning time on a first start when I drive I feel little “tik tik” sound when I release accelerator rather as car engine oil get its optimum temperature sound get vanish or feel very light. Is it normal? I live in a country (pakistan) where more then 6 month of summer and temperature get rise about 48c in June. So kindly guide me shall I keep use OEM recommended viscosity or not