Weird, I thought once it was crushed it was crushed. It's not a lot of money, but it'll save a trip to the stealership.
He's right. As long as you don't over tighten. If over tightened, the washer will crush to a point where it will not seal unless you keep getting it tighter and tighter further running risk of pulling out your threads and splitting the washer. I wasted the first washer in 3 oil changes. I am still on my second washer after maybe 8 oil changes. I think it was over tightened at the dealer. Anyway... it's still nice to have spares. Oil isn't cheap and you can't change it easily once you have added oil if it leaks. I change it when it is squished past being able to easily run it off the threads of the drain plug. When it gets to that point, you have to hold it with pliers and maybe bend it til it breaks. Then replace it.
and you can re-use the one over and over and over...
I was wondering about this... I've owned my bike long enough for 2 oil changes now (first street bike), and when I bought the oil and filter they made a point of adding the crush washer to the bill and saying "You HAVE to replace the washer every time you change the oil" It was cheap so I just figured 'Whatever' and went on my way. This last oil change I noticed that the washer coming off looked just like the new one going on... not crushed or deformed in any way. I now have 2 so I'll just alternate between those from now on.
Technically this is a sealing washer not a crush washer. A crush washer is the type used on spark plugs. Honda has been using that same 12 mm washer since the early 70's. I went years and more oil changes than I can remember using that original washer. As stated before the key is never over tighten the drain plug. Don't ask about torque settings, it's something you just have to get a feel for.