oil filter thread
Senior Member
Joined: Jul 2001
Posts: 506
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I believe it is 20mm if it is the same on an early 2000 Beta. I use Amsoil Superduty filters and I just got a few last week. Doing a quick Google search finds this same filter (SDF20) on this page where they list the thread size at 20mm. From looking at the bottom of the filter, it looks like that is right.
