Is Viscosity the Least Important Aspect of a Oil?

[427Z06]

Wow...my faith in the BITOG forum has been restored. One of the most intelligent conversations I've seen here.

 

[MolaKule]

quote:

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What vicosity would be required at 100C (212F), 5.25 cSt SAE 5-20

125C (257F), 5.25 cSt SAE 30


150C (302F) respectively? 5.25 cSt SAE 40

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The above are considered minimum viscosities at the temperature specified as per an SAE/GM paper on minimum lubricant films in engines.

 

[Gene K]

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Originally posted by MolaKule:

quote:

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What vicosity would be required at 100C (212F), 5.25 cSt SAE 5-20

125C (257F), 5.25 cSt SAE 30


150C (302F) respectively? 5.25 cSt SAE 40

---

The above are considered minimum viscosities at the temperature specified as per an SAE/GM paper on minimum lubricant films in engines.

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Thank You! This lends some creedance to the FRPP Advisor who told me:

Drag Racing = 5W-20

AutoX = 0/5/10W-30

Road Course Below 80F (27C) = Synthetic 10W-30

Road Course Above 80F (27C) = Synthetic 10W-40

Gene

 

[Gene K]

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Originally posted by 427Z06:
Wow...my faith in the BITOG forum has been restored. One of the most intelligent conversations I've seen here.

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And now their making fun of me

Gene

 

[MolaKule]

quote:

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What vicosity would be required at 100C (212F), 5.25 cSt SAE 5-20

125C (257F), 5.25 cSt SAE 30


150C (302F) respectively? 5.25 cSt SAE 40

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Reasons are that most oils, especially dinos, thin under high heat and shear stress; synthetics much less so.

So a dino 10W40 would suffice or a synthetic 10W30 should suffice.

The last temperature is an extreme that is rarely seen.

Do a search on viscosity and clearances as well; I know we have had at least two prior discussions on each.

 

[427Z06]

quote:

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Originally posted by Gene K:

quote:

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Originally posted by MolaKule:

quote:

---

What vicosity would be required at 100C (212F), 5.25 cSt SAE 5-20

125C (257F), 5.25 cSt SAE 30


150C (302F) respectively? 5.25 cSt SAE 40

---

The above are considered minimum viscosities at the temperature specified as per an SAE/GM paper on minimum lubricant films in engines.

---

Thank You! This lends some creedance to the FRPP Advisor who told me:

Drag Racing = 5W-20

AutoX = 0/5/10W-30

Road Course Below 80F (27C) = Synthetic 10W-30

Road Course Above 80F (27C) = Synthetic 10W-40

Gene

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These are nice general values assembled by one of my favorite groups of people, namely automotive engineers, but aren't some adjustments needed for the particular design of the engine?

 

[427Z06]

quote:

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Originally posted by Gene K:

quote:

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Originally posted by 427Z06:
Wow...my faith in the BITOG forum has been restored. One of the most intelligent conversations I've seen here.

---

And now their making fun of me

Gene

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Hey Gene, I think you may have a typo in your profile. Shouldn't your occupation read SOB, instead of SBO?