Do you replace oil drain plug washer...

I usually replace. But if I run out I would reuse without much of a thought.

On my CVT I have reused the crush washer on the fill port. I figure, it's not doing much.
 
Good thread thus far. Do some cars drain plug just use a regular steel zinc-plated flat washer? In the past (when I was still physically able to change my oil) it looked like an ordinary steel flat washer to me (on my 1996 Jeep 4L).
 
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Good thread thus far. Do some cars drain plug just use a regular steel zinc-plated flat washer? In the past (when I was still physically able to change my oil) it looked like an ordinary steel flat washer to me (on my 1996 Jeep 4L).
A plain steel washer is not designed for sealing. It's designed to give a bolt head a surface to turn on while being tightened.
 
Crush type washers deform to effect a seal. Additionally, the deformation may work harden the (metal) washer which along with the initial deformation, may affect the washer's ability to seal again. Most of what I own use aluminum or copper crush washers and I generally replace them each time, but I have smoothed and re-annealed a few in a pinch. At ~$1 a seal tops, cannot see a reason to not replace them.
One reason is that they are as much as a dollar a seal.
 
I have my oil changed at a local lube pit that I’ve been using for decades. I always provide my own HPL, filter, and a new OEM rubber washer. We’re talking sofa change here, so my anal-retentive OCD nature is well served. 🤷‍♂️
 
I've re-used tranny, diff, crush washers before. In my young days, I never replaced an oil pan crush washer. Then started using those stupid rubber/ silicone ones ( useless because they crack ),,,,,then I started using regular crush crush washers at every OCI. Wisdom as you get older. Back goes bad as you get older too :(...Then you're stuck with a mess of tools you can't use anymore. Some date back to 1977, and they work the BEST !!!! I said it before, sometimes I'll sit on a stool in my garage and cry. The mind says do the job, the body says NO !!!! Very sad when you get to that point in life. Sux to get old. I'll be 59. But my body is probably more like 89. Wrenching takes it toll on you. Sorry for the depressing rant :(
 
I have a bunch of them, and I do change them out, mostly. There have been times I climb under the car and forgot to grab it, shrugged my shoulders and put on the old one.
 
After 8 years on my Civic, I changed the washer. Kept reading these threads shaming people for reusing the washer. Ha ha. I know it doesn't matter unless the original is deeply grooved, but I figured it was time. Looked for OEM washers, but not willing to pay $10 shipping from a proper dealership source. eBay was filled with fakes; china sellers printing up "Honda" labels with the PN on it. In the end, bought a 50 pack off Amazon from Mudder, for $7 shipped. The washers are good quality. I'm now set until year 2425. Peace of mind is a wonderful thing.
 
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