graycarpet,
Boondockonly probably said it correctly, you have the center gasket doubled. this won't allow the filter to engage the threads without a lot of upward force. Also the tip about using only the AC Delco filters is a good one, If you read on any of the Duramax forums, this is what they tell you, unless you switch to the Cat filter w/adapter, which is just as good but a lot cheaper to change.
Frank
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05 Alfa Gold 40' Motor Home "Goldie",
03 Malibu Toad
in a 24' CargoMate trailer.
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