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Technically, those are sealing washers rather than crush washers. The primary goal of a crush washer is to limit torque on a fastener by deforming once you reach the correct torque - it collapses and can only be used once. The primary goal of a sealing washer is to deform just enough to the mating surfaces to prevent leaks once the proper torque value is reached. A sealing washer can be reused, but it's not the best practice because its ability to seal can be reduced with each reuse. Here's a crush washer:I reuse crush washers whenever possible but some shops just push the limits of the design. I’ve seen these crush washers on family member or coworker vehicles 🚗 that come by for some diy work. The oil jocks just tighten the drain plug until it stops leaking and some use some putty. No thanks as long as I can crawl under safely I do my own oil changes. View attachment 143519