<The filter from BMW comes with a large O-ring, a small O-ring and two small washers. I know what to do with the first - and I did - but what do I do with the three small bits?> The smallest rubber O-ring goes on the tip of the filter housing lag-bolt. The two metal washers are used at the top of the filter housing lid, and at the oil drain plug. Regards, Jeff 93' 318iS 84' 318i