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Ford 9N, 2N & 8N Discussion Forum
:

Re: 2N - ok to use 10W40 oil ?

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TheOldHokie

06-21-2020 06:23:45




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Let me expand on that a bit. When hot the viscosity of these two grades is almost identical. Some real measured product viscosity data to illustrate that point. I have picked the widely touted Rotella as my baseline:

Shell Rotella T 15W40 - 15 cSt @ 100C

Shell High Mileage 10W40 - 15.5 cSt @ 100C

Mobil 1 High Mileage 10W40 - 16.0 @ 100C

As you can see, at operating temperature in both of those two 10W40 oils are actually ever so slightly thicker than the Rotella 15W40. The difference is so small as to be insignificant and that is my point. You can find other brands/formulations of 10W40 oil that are slightly lower than the Rotella product but again the difference is not significant. ALL brands and formulations of ALL xxW40 grade oils fall in the same SAE defined viscosity range for grade 40. (12.5 to 16.2).

Where the viscosity difference between 10W40 and 15W40 gets to be VERY significant is at 5F (-25C). At that temperature the 10W40 is still pumpable and the 15W40 is not.

TOH

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