I've been reading a lot of posts about changing the oil on an Audi today, and I've seen a "copper crush washer" mentioned by some people and not others. I drive a '99 A4 1.8T. Will my car have one or more of these washers? Do I have to replace them? Where can I buy them? Thanks.

 

THere will be one on there right now. You can buy them at your local auto parts store.