Interesting read in new GT500 Owner's Supplement

Discussion in 'Shelby GT350 Mustang' started by Rainier42, Nov 3, 2019.

  1. Rainier42

    Rainier42 Well-Known Member

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    Reading through the new 2020 GT500 Owner's Supplement, going through Maintenance and Fluids. For colder climates, Ford recommends 0W40 meeting their A-spec (WSS-M2C937-A). Would think this would work for the GT350 as well if driven in cold weather. Thoughts?
     
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  2. Droopy1592

    Droopy1592 Well-Known Member

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    I always thought it would be a good substitute. My operating temps rarely go above 185 in the winter and that’s in GA. 0w-40 should more than cover that.
     
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    Rainier42

    Rainier42 Well-Known Member

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    Agreed. I wonder what swayed Ford on this?
     
  4. Demonic

    Demonic Well-Known Member

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    Just remember that running an oil weight and spec clearly different from what's spec'd for the model is a very legit grounds for warranty denial. You cannot argue back to Ford that since it was ok for the GT500 you figured it'd be fine, or that a bunch of guys on the internet told you to.
     
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    Rainier42

    Rainier42 Well-Known Member

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    Agreed. Just curious as to why Ford ok'd this for the GT500 and not the GT350.
     
  6. I am Jeff

    I am Jeff Well-Known Member

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    I wouldn't be surprised if ford quietly revises the oil specs for the 2020 or 2021 gt350 owners manual. Manufacturers make revisions like that all the time.
     
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  7. DBL-E

    DBL-E Active Member

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    Here’s a pic of oil recommendations from my 2020 GT350 supplement A2BAF4FA-A12D-471F-B3D3-8444FF4E9BAB.jpeg
     
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  8. Droopy1592

    Droopy1592 Well-Known Member

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    Dumb question. I’ll be driving a 17 with a 19R motor. Could I use 0w-40 in the winter and not upset the warranty Gods?
     
  9. JR369

    JR369 Well-Known Member

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    Winter in Atlanta? As in extreme cold climate? Isn't that like winter in TX?
     
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  10. 16Kobra

    16Kobra Well-Known Member

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    :cwl::cwl::cwl:
     
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    Rainier42

    Rainier42 Well-Known Member

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    Wow, thanks for posting this. Big change! I assume this recommendation is backwards compatible through all years?

    Also, look right above that regarding the 5w50 oil ... says oil needs to meet WSS-M2C931-C OR API SN requirements. That opens up oils not on the current approved list and is BIG!
     
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  12. I am Jeff

    I am Jeff Well-Known Member

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    Don't worry, I'm sure that the Amsoil crowd will chime in that there is only 1 oil that everyone should use. :cwl:
     
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  13. Droopy1592

    Droopy1592 Well-Known Member

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    All of my cars reached operating temp in GA winters except this car. The cooling is too effective. I’ve sat in Atlanta traffic at 170.
     
  14. JR369

    JR369 Well-Known Member

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    Since you have 19 motor I'd say the supplement covers you in black and white to try the 0-40 if you want to. I'm interested to see if your temps rise. Is 191 normal operating temperature or is that just a required temp for the RPM limit to move?
     
  15. Droopy1592

    Droopy1592 Well-Known Member

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    everyone seems to agree that’s where these motors are safe to rev or to put your foot into it, 190.
     
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