Aardvark:
This is only tangentially related to weather, but Chit Chat group has the distinction of (so far) having the blessing of the owner to discuss anything that doesn't fit any where else, except for politics and religion.
I've had some very helpful discussions, and the neat thing is that many of the readers of this group have very excellent and varied backgrounds with real life experience, not just 'end of bar' learning that some people preach knowing something about when there really are no facts. It has been a wonderful forum branch and a lot of fun.
I too recall having to do the winter weight and summer weight oils. A pain. My now long deceased dad and uncle told of having an old early car and when they ventured out in very cold weather, would park the car by the friends, the 'women folk' would run inside while the men would jack up a rear tire and drain the oil from the engine into a pan which then they put by the wood fired stove to keep it warm. When it was time to leave, everyone got bundled up (no ski jackets or down comforters) and the men would take the oil out, dump it in the engine and then crank the engine until it started. With no true clutch, the hind wheel would rotate easily and allow a faster crank so the magneto would fire the engine somewhat easier.
Then Bendix came along....
The other risky story was if it was very cold and the car hadn't been started in awhile, they'd build a charcoal fire in a flat pan and once going , slide it under the car to have the rising heat try to impart some warmth to the block. I don't think I'd have nerve enough to do that!
The whole gist of the comment about using what oil you trust and feel OK with lends itself to the idea that most of us have very limited numbers of engines we own, and we don't skimp on oil or such since if one goes out, it s a very expensive experiment.
I'm sure the government has taken say 100 identical engines, treated 50 with one oil, the other with the other brand, and then every couple hundred hours have a skilled mechanic with no horse in the race tear it down, take measurements, do careful oil and filter analysis to see if one is better than the other. This is something that ordinary people can't do for time and financial reasons.
The 'impressions' that some mechanics have about using only Brand X in their engines and they looked immaculate when they tore one down after 10 years or something is purely anecdotal. And if you are on a family vacation in the middle of Utah at 9000 feet in hot weather, the last thing I want is anecdotal facts guiding me.
My dad said as we changed the farm tractors' oil that it was cheap compared to doing an engine overhaul and the time lost when you were working long hours and your tractor coughed up a piston.
Any way, there seems to be almost no real facts available, so I was requesting the experience of those learned folks who hang out at this end of the bar.
Dale