Yes-this is my first diesel-and I'm in love!This is also my first foreign car.And-yes, I know that clean oil doesn't mean it's good oil-I just found it interesting that it got black so quick!As far as the location of the 2 small o-rings-they are on the bottom of the stem on the oil filter cap/lid.As a side note-I also blew out the holes in the stem with air and brake cleaner-a lot of crud came out!