They recommend replacing it at every oil change. Subaru engineers in their infinite "wisdom" elected to equip that car with a real live crush washer, original is copper, domed side to the pan flat side to the plug head. That helps prevent dirt from getting in there & preventing a good seal.ĮDIT: Oh, Crap. I've never changed a drain plug gasket - I've never seen one that leaked significantly enough to warrant replacement.ĭo wipe around the drain hole, and wipe the existing gasket, before putting the plug back in. I've been changing my own oil since 1975 or so, Daniel, more often than not, several cars at a time (it's been a long long time since I've only had one vehicle). I want to do the best thing here, but I don't know what that is. I guessed it would be fine to leave it in this time. The contact with the pan and plug head is smooth, and the thread of the plug is very good. My current washer is metal and seems in good shape. Some say metal is better, some say it's worse. So far I've heard fiber, nylon, rubber, copper, aluminum, and steel referenced.
My question arises because in doing internet research before the job, I found that it's often recommended to change the oil drain plug gasket. However, I changed the oil and filter myself today, so they won't need to this time. 3,000 miles have rolled by since then, and I'm sending it to the shop again to have maintenance done (and a few details checked on). I've recently purchased my first car (2004 Subaru Legacy), and though I sent it to the shop soon afterward for routine maintenance, I want to learn and do as much as possible myself.
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