If thin oils are bad then Toyota is stupid?

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I will say that we just had a new Camry as a rental. I could not be more disappointed and would not put my kids in it!
It eels like it could blow apart if the passenger farted! But that's to be expected with these little throw away cars...

Back to the point though, the car had the 0-8 and the motor was begging for different oil... The car had less than 15k mi and it sounded like a 100k mi 4cyl from the early 80's. I have never in my life witnessed that type of vibration, engine noise and just noise overall horrible performance from even a 10 year old, 100k mi 4cyl... Very disappointing, but also verified a concern!
 
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Those owners manuals seem to refer to 'best fuel economy' as main reason for thinner oil, some little older manuals also mentioned that if vehicle is driven hard (high speeds or mountains etc) or tows it'd be better to use a little thicker oil. So, oil film thickness makes difference, too thin or too thick oil make little sense to use. Since due to C.A.F.E. manufacturers recommend the thinnest oil engine can reliably run on, a little thicker oil will never hurt and will benefit engine's longevity; I mean a grade higher e.g. 5w-30 vs 5w-20 or so.
 
Quote from toyota manual

“An oil with a higher viscosity may be better suited if the vehicle is operated at high speeds, or under extreme load condition."
And there you have it. A "thicker" oil is not going to grenade the engine, not flow into "tighter tolerances," or in extreme cold. I'm just regurgitating nonsense I read here from time to time. It's also amusing when a new member, [the OP] knows exactly how to stir the pot here. ;)
 
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