Greases are non-Newtonian fluids so their viscosity changes when a shear force is applied.
Agreed. But that doesn't mean it always drops to zero, or that any force is sufficient for any grease. Dielectric grease is thick; electrical grease is thin. If you want the terminals to make contact, use the thin grease.
So you can actually have a thick grease (to block out dirt, air, and moisture...
It doesn't take thick grease to block moisture or anything else. It only takes a non-permeable film. And that's what dielectric grease is specifically engineered to do, with respect to electricity.
...ketchup won't start flowing unless you shake or smack the bottle.
Now you're really getting off-topic!
The electrical connectors in vehicles are exposed vibration and elevated temperatures, combined with awkward orientations.
So are the ball joints, wheel bearings, & virtually every other greased component on a vehicle. So you're saying all those greases thin-out & allow metal-to-metal contact? Silicone grease is one of the best for NOT changing viscosity as temperature changes.
Straight from permatex's website...
Did you read it before you posted it?
...a product that says it is for a purpose.
What purpose does that say? Because what I see says it BLOCKS electricity (voltage leaks) exactly like what I've been saying all along. It does NOT say to put it on electrical terminals - it says it can protect CONNECTIONS from corrosion; not that it's good for electrical flow. You're incorrectly inferring something based on the briefest blurb about that product - you haven't read the actual instructions, which PROBABLY say (correctly) to use the grease only on the plastic & rubber parts of the connector to aid in assembly & disassembly, and to exclude moisture from the multi-pin cavity; not to put it on the actual terminals. And it doesn't say to put it on the spark plug terminals, either. Just like the Ford site, it says to use it to prevent the RUBBER BOOTS from sticking to the ceramic.
It's no wonder you're so confused by this - your reading comprehension is terrible. Read what it actually SAYS, and don't imagine it's saying things it DOESN'T say.
Who cares what they call it!
So who cares if they call it a Bronco or a Jeep? What's in a name? Why should you care what a word means - just use any old work two cey Watt Hugh ouannd. Wheel finger owt wut u mint.
...dielectric not only conducts but conducts better than metal on metal...
Did you actually read what you wrote there? %) Get a tube of dielectric grease, put a line of it on a plastic or glass surface (a known insulator), and touch some hot wires to each end of the grease line. Then tell us all how well it conducts, compared to touching the wires directly together.
This is getting really boring saying the same thing over & over, and having it misread, misinterpreted, & misunderstood every time. Take a bath in dielectric grease if you want - it won't bother me. I'll keep putting electrical grease in my connectors, and they'll keep working. Your results may vary.