Newbie here...I just changed my oil on my B7500 and dropped the drain screw in the oil pan. I could not remember if there was a washer on it or not from previous changes...checked the manual, and it did not mention or show one. Put the drain bolt in and drained the old oil out of the oil pan, and saw the copper washer...Duh! Why didn't I check thoroughly for the washer before adding new oil? Called my dealer and he said it could leak when it got hot. I am in Northern IL and use the loader to plow my gravel driveway. It is below freezing, so I am inclined to remove the drain bolt and re-insert with washer and hopefully minimal oil loss and mess, but I thought I would ask if anyone has had an issue with them leaking without the washer. Not a drop has leaked, but I have not run it and got it hot yet. Better safe, than sorry, right? I'm very happy I found this site! Thank you!