RWL wrote:
My Subaru's oil drain plug requires a crush washer to seal. I tried
reusing the old washer, but oil dripped out and I wound up having to
buy one anyway. Has anybody found a good substitute that can be
reused, or is at least cheaper than the $1 a washer that Subaru wants
for these.

It's not as though I don't have any ideas - copper washer, O-ring, or
even a couple of wraps of 1/16" solder would probably work, but it's
nice to hear from the voice of experience.

My suggestion is to order your filters
10 at a time, along with crush washers,
from Auburn Subaru:

http://www.auburnsubaru.com/en_US/

Great prices, service and people.