Oh, you're gonna do this again, huh? Just like the "ethanol is teh ebil" thread? I should know better than to bite on your obvious troll bait, but I hate seeing others misinformed by people who have just enough knowledge to be dangerous.
For those not aware, I have a great deal of mechanical experience, definitely more than this guy who seems to enjoy trolling every technical he sees me post, and I also have not only certified master mechanics and mechanical engineers in the family but people teaching such things at a college level to those becoming certified in these fields. I also don't vomit out a line of crap, pseudoscience, and myths because I only speak about what I KNOW that I know about unless I've specified otherwise.
Since when? ...Most I've changed...I know of no others
Yes, they are absolutely designed that way. Doesn't mean it always works. Yeah, most that people change have stuck partially or fully closed because that's when people NOTICE. It is known by every competent mechanic and automotive engineer that this is a FACT.
the oil turns to paste.
Show me an engine being drained of this "paste" aside from a few traces like clouding on sight glasses. It's a non-issue for a vehicle that gets up to operating temp even occasionally.
Has to happen in the crankcase too.
Not to any appreciable degree from just sitting, and if the engine gets decently hot at all, it will drive the moisture out, otherwise we'd have a lot of cars with iron blocks and heads just rusting holes right in them.
To say that oil does not go acidic, flies in the face of decades of motoring data that says otherwise.
You're being nonspecific to be misleading. The reserve alkalinity depletes and you get viscosity "breakdown", yes, but that's from heat and mechanical degredation, NOT from sitting. If you knew the first thing about organic chemistry, you'd understand the underlying principles. You don't, and you don't, and I have a damn degree in it. Seriously, you don't know who you're arguing with all the time.
Letting it sit does essentially zero to both alkalinity and condensation. Think about the source of the article and how oil companies and Jiffy Lubes have been saying for decades and are still telling us to change every 3000 miles. It's a load of crap.
I know better than to reply to your trollish goading again, so don't expect a response.