Fingers crossed it'll cut ally

[Fivetide]

Oil filter seals aren't any softer than o-rings, and by the time they get changed, they've usually hardened up even more.

You do get o-rings made from softer material, but they're not common place.
I wonder what the proper name for the seal strip type stuff that comes in strips and used for sealing junction box covers is called. I've worked on various junction boxes, where the seal is just a press fit into a machined groove. It's usually a round or rectangular shape, and is normally very soft so you get a good seal with minimal pressure.

I know what you mean M_C old tobacco tins use to have an orange'ish rubber seal but now it looks like some kind of bonding ..and comes away in bits.The other thing of course is jam making jars .. u can get replacement seals in all sorts of sizes.. they are flat an i think quite soft, I shall borrow one off my mum on Sunday :)

Jar Seals

[m_c]

A quick google for "enclosure sealing gasket" turned up this on ebay.