Guys for 1KRF engine, always use 0w20, nothing else, always use GF-5 approved oil, pls note 0W20 can bear heat up to 200-220c, while engine operates at 100-120c.
Pls step out of old approach using think oil, smaller the engine with low compression use the thinner, bigger the engine, with high compression, use think oil even they use 0w50, try to always choose first digit 0W.
You will end up regretting after 60k or 80k millage, i had practical experience with multiple cars, rest you may ask Atta Bahi