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OEM Oil Filter came w/washer?

1.2K views 8 replies 6 participants last post by  speeder760  
#1 ·
After reading many articles about how bad Fram oil filters are I went and picked up an OEM filter from my mitsu dealer but I'm confused because it came with a little metal washer.

The guy at the dealer said to make sure I replace this(the washer) everytime. I should have asked him what it was for but I thought I'd be able to figure it out at home lol.

The washer seems to fit on top of the whole where you screw the filter onto the engine but placing the washer there prohibits the filter from scrwing on.

Does anyone know what this washer is for?