Visual of oil viscosity

[D2Cat]

4M views · 13K reactions | Engine Oil Viscosity Test 😲😲 | Fernandez L. Jayson

Engine Oil Viscosity Test 😲😲.

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[William1]

Odd.... I'd expect both 5W to be the same at room temperature. Got to be something off with that test.
A better test would be a drip test. A quart and a tiny hole for each sample and time to drip a quart. Oil rating is viscosity, 'thickness'/ability to flow not film strength. Do this test in a freezer, then again at room temperature then again heated to 180f.

 

[lugbolt]

in terms of engine oil, viscosity refers to how 'well' it flows.

Remembering that modern engines have much smaller oil flow channels and galleys, and often much longer distances from the oil pump too.

so when the manufacturer says use 0w40, it's for a reason and not so much MPG or emissions as it is to make the engine last longer. A cold engine at startup needs oil pressure to everything as soon as possible and 0w40 will achieve that goal faster than 20w50 will.

There's a lot more to it but that's the very basics. Use what the mfg says.

 

[lynnmor]

There's a lot more to it but that's the very basics. Use what the mfg says.

Of course there are exceptions like the GM 6.2 where the thin oil has destroyed many engines. GM updated the owners manual and the oil cap to show thicker oil.

 

[RCW]

Of course there are exceptions like the GM 6.2 where the thin oil has destroyed many engines. GM updated the owners manual and the oil cap to show thicker oil.

I had only heard of 6.2l issues generically - - no details.

Looked it up today after seeing your reply.

Sounds like root cause gets back to the 0w-20 motor oil and AFM.

Heard of similar problems with earlier 5.3's but not to the extent they're seeing with the 2021-2024 6.2's.

Right or wrong, I drive my 2017 5.3 in "Manual 5," which locks out the AFM. Probably hasn't run on 4-cylinders for 500 miles in 8 years.

I actually think I get better MPG on hilly two-lane rural roads. 20+mpg is normal in the summer. 16-18 in the winter.

 

[lugbolt]

Of course there are exceptions like the GM 6.2 where the thin oil has destroyed many engines. GM updated the owners manual and the oil cap to show thicker oil.

that engine will not stay together on any oil. Poorly designed, or should I say it had a decent design but poorly executed. GM knows this. They're trying to shift the liability to the owners. It's what they've done for years and why I do not buy GM vehicles, which is unfortunate because there are things I do like about them, well some of them. It's a matter of principle, that's all.