Thread: 30w oil
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Old 02-09-2019, 12:20 PM   #15
Purdy Swoft
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Join Date: May 2010
Location: Alabama
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Default Re: 30w oil

The model A engine needs a certain amount of viscosity to cushion the bearings . Ford recommended 20w for winter and 40 w for summer . I use multi grade oil , but figure that a 10w whatever would be too thin to give the necessary viscosity for the older engines when warm . There is more to it than quick flow , in my opinion .
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