Oil bypass, do you block it?

[Bobby DiDomenico]

Originally Posted by Rich Biebel

51060 has an anti drain back valve and 51061 does not.

Same filter other than that.

51060 is used for horizontal type mounting....
51061 is for vertical type mounting....

Interesting Rich, is it listed in the spec somewhere and I missed it? Had a few stores try to sell me filters w/o the anti drain back for my Buick, always passed figuring it would enhance the mess when I changed it.