Perhaps this should be a lesson in that it doesn't much matter 10W-40 or 20W-50 or anything in between?
I put 0W-20 (as specified) in my Subaru.
Decades ago a coworker was an SAE member, received the SAE Journal, and loaned many copies to me. It was outrageous at the time but Ford and GM engineers co-published a paper which turned the understanding of lubrication and plain bearings upside down. Said they could lubricate better, longer life, less friction with 20-weight and even less. However the bearings needed to be designed for the less viscous oil. IIRC the tolerances are tighter, that they need turbulence or a shock wave.
So today when the manufacturer says 0W-20 I don't lose any sleep over it. It is much more than, "Management says make more MPG."
2018 F-150 XLT SuperCab 4x4 2.7L
2016 Beta 430 RS
2016 Subaru Outback
2013 Tesla Model S 85
2009 Husaberg FE450
1983 Porsche 928S