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Cavitation will happen at -15 psia. Given that my oil pickup is an 8 inch tube and that my coldest starts are roughly freezing, I don't think I'm in any real danger of pickup issues.
No, but flow is pressure dependant.
If my mains flow enough that pressure drops, then my cam will starve. Or vice versa. You have to have sufficient pressure to lubricate all parts. I have to have sufficient pressure to keep my lifters pumped up. If my thin oil flows too much to some passages, pressure, and thus flow will drop to others.
This is why blanket advertising statements don't work. Be familiar with your equipment. Have a handle on your needs.
And while your owner's manual may tell you what weight of oil to use, the engineers didn't really care about bearing clearances at 150k miles. There are a few valid reasons to change based on use, climate, and mileage.
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