Why not just call your dealers service dept that I'm sure does 500 or more oil changes a week and ask them if your car has/needs a washer on the drain plug...I'm sure they would certainly know and help you before you start putting on something your not suppose to have(although I don't think adding a washer would hurt) most washers I have seen on newer cars oil drain plugs were the type that had a ridge keeping them on so they couldn't come/fall off(good idea)...if you do put one on use a nylon one...by the way my 03 rolla hit 36k and out of warranty and I just did my first self oil change and my plug didn't have a washer either and after three weeks its not leaking any oil........Raddman
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"HONK IF ANY PARTS FALL OFF"