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- Thread starter Bettez88
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So what I can get easily is either Castrol 0w40 or the 5w30 both European. Which would be better for 10k oil changes?
Yes.
Lol yes?
I guess I’ll run 0w40 since everyone seems to speak highly of it, and it literally covers the largest temp range
The grade is a result of the requirements of the approval. For example do you think you could formulate 10w-60 or a 5w-20 with a HTHS of 3.7? Me thinks not.
No it’s not. The HT/HS is the engineering requirement, the grade is a result. “Permitted grades” for those approvals is a marketing decision except possibly for the winter rating.
HT/HS does not necessarily equal grade.
HTHS correlates with grade no? And it's not only HTHS but other test and engineering requirements which would necessitate particular grade-range.
Well you can certainly have different grades with the same HT/HS, so it may be correlated somehow but it’s not determined by it. Both are measured differently of course. We had a discussion about that once and it was explained that not all the same exact factors are determinant, for one thing the amount and type of VII can affect the HT/HS in a way that isn’t the same as the grade.
Sure. But as you know in those instances the oils in question have viscosities which are near the boundary between the two grades and there's a limit to the amount of VIIs which can be blended. Ex. Oils with a HTHS of 3.5-3.7 are typically "heavy" 30w or "light" 40w. I don't believe its possible to formulate a long drain 20w with a HTHS of 3.5 or more.
No you are correct. But I was just railing against the (to me) arbitrary grade designations called out in the VW approvals. As I mentioned, Mercedes-Benz does not do that for most approvals, they only list acceptable winter ratings and let the grade fall wherever it falls. From an engineering standpoint I think that’s more reasonable since 1) it doesn’t matter and 2) it’s not a critical performance requirement.
4WD
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Shear Thinning and Hydrodynamic Friction of Viscosity Modifier-Containing Oils. Part I: Shear Thinning Behaviour - Tribology Letters
Viscosity versus shear rate curves have been measured up to 107 s−1 for a range of VM solutions and fully formulated oils of known composition at several temperatures. This shows large differences in the shear thinning tendencies of different engine oil VMs. It has been found that viscosity...
link.springer.com
Nah, that is VW trying to confuse drivers with oil since 1997.
ONLY thing that matters is your approval.
Not always. 30-multi-weights can be a high HTHS (3.5 mPa min) or lower HTHS (less than 3.5 mPa), depending on the specification it needs to meet, for example VW502.00 and 504.00 needs the 3.5 mPa min. Your usually off the shelf Mobil 1 5w30 for instance won't be the 3.5 mPA min HTHS product. a high HTHS 0w30 would need to meet VW504.00 (Mobil 1 ESP 0w30), while a lower HTHS 0w30 would have GM Dexos 1 (Gen 2) approval (Mobil 1 AFE 0w30) or VW506.01 (for instance from VW spec standpoint)
40-weight oils are usually high HTHS.
20-weights are on the lower end of the HTHS
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Of course but there is a min-max HTHS you can have for any weight. For example you'll never have a PCMO in a 20w with a HTHS of 3.5 or a 40w with a HTHS of less than 3.0
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Isn't VW big on Castrol edge ep?
Big as in a marketing agreement for initial fill? VW is big on approvals. Which VW approvals do the EP products have?
