Quote:
Originally Posted by SouthArk370Z
You need lube if the parts screw together (relative motion between gasket and mating surface) to prevent the gasket/o-ring from scrunching up. Not usually necessary if they bolt together.
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This was my line of thinking at first, but if you think about it the oring on the sandwich plate is stationary between the plates while it's being installed, but the oring on the oil filter does screw on (my original way of looking at it was wrong)