Kevin, you are sure that you are getting the small inner O-ring off when you remove the old filter?
If that O-ring accidentally sticks on there, then when you go to install the new filter it is hard to get the outer gasket to seat all the way on the filter head and that can lead to air leakage into the filter when running... good idea to always check by feeling in there with a sterilized clean hand when you have the filter off. Once I worked on a Volvo that had 2 old crusty O-rings stuck up there! Does not help it run right...
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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