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sammyd November 25th, 2018 10:40 AM

Oil problem
I have a 77 400 rebuilt in my truck. Ran great at startup now blowing oil past filter gasket. Is there a passage blocked or what? Any help is appreciated

glc November 25th, 2018 11:41 AM

I'd suspect a defective oil filter or the wrong filter was used. Use a Motorcraft FL1A.

sammyd November 25th, 2018 12:15 PM

Used motorcraft fl1a and two other brands, same result, never had this issue before. Was good for a few minutes and then it blows gasket on front side of filter. Didn’t know if there’s a bypass valve or blockage on engine side?

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