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The "W" grade is not determined by how the cold oil "flows". It's measured by special machines (for CCS and MRV) and it's a dynamic viscosity (in units of cP), not a kinematic viscosity like the hot SAE grade is (in units of cSt), which is a flow under gravity test. The HTHS viscosity is also...

Yes, pretty much everyone should know that any liquid will be thicker (more viscous) when cold. But what you said below isn't right. Again, the "W' grade rating is a totally different rating measurement (no connected to the hot viscosity grade) than the hot grade in a multi-grade oil designation.

The 5 in "5W" really isn't a "weight". It's just a "W" grade designation per the SAE J300 definitions (see table again) that the oil must pass - both CCS (cold cranking) and MRV (pumpability) viscosity limits at defined cold test temperature - to achieve the appropriate "W" rating.

Yes, when oil is cold, it's always more viscous ("thicker") than when it's hot ... if that's what you mean in general. But the cold "W" viscosity grade rating has no relation to the hot KV100 viscosity grade in a multi-viscosity oil. The "W" grade is determined by totally different...

You tell me, not a mind reader. 😆 What else can you tell us about motor oil? 😉

LoL ... you do realize that when you quote someone's post and reply to it, that anything you write (unless you make it clear otherwise) is essentially like you're speaking to the person you're replying to, so they may take it that way. Now if you make a statement in that post about someone...

To add ... specifically when compared to other multi-grade oils. A 5W is only lower viscosity than a 10W or 20W at the same temperature. Same with the hot side (KV100) grade designation. 30 grade at 100C is thinner than 40 or 50 grades at 100C. The "W" rating and the hot KV100 viscosity...

It was something in your response to me, so I'm not a mind reader and should know it was meant for someone else's post.

Words have meanings, and terminology matters in technical discussions. 😉 The way you said it was not accurate as stated.

You said in post 55: Yes, they are the same viscosity grade, but they most likely will not be "identical" viscosity (KV100) as I explained earlier. I never said or even suggested the grade boundaries will make a 5W-30 the same as a 0W-40. I simply said that not all xW-30 grade oils have...

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No, all oil is thicker when cold, and gets thinner as it warms up, regardless of the multi-grade designation. The "W" rating and the hot grade rating are two different measurements to define the xW-xx grade of motor oil.

Not necessarily identical, since the hot viscosity rating is a grade range, defined by SAE J300. So one xW-30 could actually have more KV100 (and also HTHS viscosity) than another xW-30. This is true with all oils of different brands within the same SAE viscosity grade.

I went with 5W-30 at the first oil change. The extra HTHS viscosity (which is what actually counts for operational dynamic viscosity) of the 5W-30 helps give better wear protection.

I agree that it would probably take quite a bit of carbon build up in the chamber to cause pinging. But the 3rd Gen Coyote is pretty high compression to start with, so could be it's sensitive to any increased CR due to carbon build-up. Another thing to consider is does any carbon hot spots in...

Sounds like they just cleaned the injectors - ?. If so, that doesn't do anything to help clean carbon off piston crowns and combustion chambers. Only way they could check is with a borescope. You can get the Gumout Regane at Walmart and auto parts stores. The Redline SI-1 might be carried...

Almost had it for a year ... but not anymore. 😂

If the noise (pinging/knock?) went away with 93 instead of 87 (when it didn't ping with 87 previously), then that could indicate increased compression ratio due to carbon on the piston crowns and combustion chambers. And if it eventually came back some with 93 that may also support the...

I thought there was a TSB about a rattle noise like you might be hearing. Did the dealer(s) mention anything about a possible related TSB? Have you ever ran any kind of fuel system cleaner, as it almost sounds like maybe your piston crowns might be getting carboned up with increasing mileage...