I'll bet he was seeking an quick, clear, and easy answer...
Pandora's can-o-worms!
ha, HA, HAAA!
I believe motor oil is one of the most heavily marketed fluids to the macho motorhead. Brand loyalty is a virtue to marketers.
The only bona fide motor oil issue, I can recall, was when the PA source oils which had a high parafin content were in wide use and there was sludge that accumulated on the colder valve covers due to "reflux". They reduced the parafin content by refining more and problem disappeared.
They meet the grade they're made for which ties to an application that was tested. Even within those groupings aren't a lot of differences, mostly newer formulae.
Snake oil has been around since snakes.
I used to have access to SAE, but retired now. But a trove of info there.
https://www.sae.org/standards/content/j183_201708/

Nice ride. Wish U luck with it and keep it going.
What's the power plant?
Lots of post war Yankee "engine"-uity back in the day.

I suggest you do a search of the available literature and stick to the reliable sources like SAE, etc. to answer your questions rather than reiterate a bunch of info that's been posted many times.
ZDDP was around in the late '30s.
I don't put much credence into some of the folklore of the pre-war period as it pertains to mechanical systems. My favorite example is the lead for valves, which was solved by changing metallurgy, not lead. Lots of marketing goo gets into the folklore and is repeated and becomes ingrained as myth.
I have several reports on ZDDP and for the most part, a portion of it volatilizes and goes out the breather, and once the surface is coated, not much else is going to happen. So there's no rationale other than to increase sales, of having very high levels and then you change it anyway? A lot of the other today's additives were not available pre-warsuch as detergents, viscosity modifiers, etc.

https://roadworksauto.com/Carpets/packard-carpet.htm

doesn't list the color choice so call them.
If it's legible, there should be a trim code on body tag. You can match the factory carpet color for that code from the parts list, if I remember right. Also the interior cloth, etc. It was in the back for 23s. It's on the main menu left highlights.
Not unusual for certain dyes to fade over the years.

Must B pretty dry over there, some of the best weathered sheet metal I've seen in ages. Who wouldn't like a good deal on a old Diamond T? Those things used to rattle the single pane windows back in the day, hauling steel from the mill up the hill. Mills are mostly by the rivers for the water needs.
I'll have to take a closer look later, but don't like "online only" for those far away things. Need to press the flesh so to speak even if you get one for mega cheap.

Thanks for the post. It wasn't on my aggregator site.

Glad we got that straight.
I wasn't around in '14, so trumped.
Chrysler '54 powerflyte 2 speed - first mechanical. '56 torqueflyte 3 speed - what I remember.
According to reports, Packard had the electric in '56 and appears was fraught with gremlins and pulled. That was also the infamous Studebaker merger times, so who knows what the reasons might have been, if P wasn't in control anymore and on "death row".
Anytime one is looking for an excuse for their casue, it's easy to find one.
A patent search would show more but I can't get done what I have now.
Does it really matter?

I have to surmise that it was sitting for a while as the onset of a grinding noise without some degree of failure is not likely.
Probably time for a bit of old fashion rolling stock maintenance, pull the wheel bearings, inspect the brakes, and lube the chassis, etc. What we keep records for. Instead of going by mileage for maintenance, go by "years/months" when cars sit a long time before we take them out.
We tend to forget that lubricants break down over time and may not be providing their function properly.
In order for a wheel bearing to "grind" all the grease would have to be gone and the balls on dry races. You'd also hear that when the tire was off. A hung brake pad or worn pad that's loose and rubbing. Hand brake stuck, etc.
There's a common mystique with classics that they need to be "original" and as factory, and regular maintenance is neglected. I hear this all the time on other brand sites, too. One guy was wanting to preserve a worn out factory wheel cylinder which he could buy new???? There's a disconnect there.

I always ascribed push button shifting to the Chrysler torq-flites. Those were the first ones, I remember, but never researched this.
It's hard to get people to change habits, so if they were accustom to shifting levers then that's what they'll prefer.
Cutting edge only applies to the "early adopters" who are looking for such and willing to take the risk of purchase and likely higher cost. More common is "wait and see" people and there's the entrenched hard cores, that won't budge.
Some innovations are necessarily self inflicted shots to the foot. Similarly, the pedal start was such a "non-starter" so to speak.
Of course, the Govt had something to say...
https://www.curbsideclassic.com/automo ... -a-government-conspiracy/

For the record, Hagen's went out April 21, 2021. ie, last year.
I have not heard of any activity on their inventory or sale of the business.

Anyone from WA know what the story is?

I've been seeing a lot of this lately, in other brands as well, and I'm not sure what's going on because most are not able to capture the pertinent data, aren't carb swavvy, but I'd asked what fuel you're using? How old, etc. condition of the tank, fuel pump, etc..
Assuming it starts up just fine when "cold" but dies when it's up to operating temp. The choke might not be opening enough but weird with the air cleaner issues, but sometimes what people think is going on/related is just circumstance.
No way to know over the internet.
I like to start with a clean slate, so I'd start with fresh fuel, clean system, and a fresh carb that's been gone through. I like to solve problems not just get through them to the next time.
I think the 928s is a WGD. I got the sheet for the 728s, but not the 928s. It should be on line so you know what your dealing with.