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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

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Old Aug 9, 2023 | 12:55 PM
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arthall
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Oil Type
I asked my wife to pick up some 15W40 oil for my 239 flathead and she found Mobil Delvac 1300 super diesel engine oil, a synthetic blend. Is this suitable for my engine? What makes it a "diesel engine oil"?
 
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Old Aug 9, 2023 | 03:50 PM
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A lot of owners run that in there Flat head.
 
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