Deteriorated O-rings on Oil Filter

[KenK]

Did my first oil change on the Bronco (2023 SAS OBX). When I removed the oil filter housing the pink o-rings caught my attention. When replacing the o-rings I noticed that they were deteriorating. See the attached pictures. 40 years of oil changes on my personal vehicles and I have never seen this before.

I've seen it in industry when the wrong type of o-ring is used in a system. A Chemical miss-match. I don't know what these o-rings were made of, but they should not be used with oil.

The new o-rings that came with the new Motorcraft brand filter are green in color. Again, don't know what they are made of. Hope they hold up to oil !!!

Has anyone seen this on their Broncos?
Is there a service bulletin that I'm not aware of?

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[BroncoWTFAN]

This is common, had the same residual for both changes I did.

 

[RustysBronco]

Yup. Common.

 

[KenK]

This is common, had the same residual for both changes I did.

This happened even with your Amsoil o-rings? I hate calling this common. It should not be. It's a sign that the wrong rubber compound is being used.

 

[RagnarKon]

Common in my experience. Changed the oil in my mother-in-law's Kia this past summer and it had the same issue. I distinctly remember it also being an issue on Volkswagen Jettas, but that may just be because it was a common car for college students (used to do basic car maintenance in college to help pay for things).

Come to think of it... I don't think I've ever NOT seen this issue on cartridge-style oil filters. Definitely not a chemist, but if I were to guess that's probably a big reason why all of these oil filters come with replacement o-rings.

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