Differential drain/fill plugs

[dkl]

Those who have done their differential fluid drain/refill, did you have to buy new drain/fill plugs? Or did you simply reuse them? Did you noticed any leaks after the fluid change if you reuse those plugs? My indy did my rear differential a couple of weeks ago (reusing the plugs, of course) and now the drain plug is developing a leak. I thought that maybe my mechanic forgot to put back the crush washer. So I head down to my dealer in search of a crush washer for the diff drain/fill plugs only to find out that they don't exist. Instead of using a crush washer, there's just a tiny rubber o-ring that's built into the plug. I ended up buying the plugs (with the built-in o-ring) for about $10 bucks a piece! I was going to do the front differential this week, but after seeing the leak on my rear differential after the fluid change have me thinking again whether I should even touch the front diff now.