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					Originally Posted by maytag  Now, a crush-washer-under-pressure, like on a banjo-bolt or other similar installation, yeah, I'm MUCH more finicky about those.  Many years ago, I bought an assortment and stuck it on the shelf. I Literally have a lifetime supply of crush-washers on the shelf, but I still reuse the crush-washer on the oil-pan.... until it gets lost.   | 
	
 
Pressure and no pressure (head pressure of less than 15cm is no pressure) 100% different scenarios. I agree.   
I ALWAYS use new flat copper or aluminum washers on brake fittings.  Oil fittings... sometimes. 
I heard an old hillbillie tell me one time you can anneal the copper back into shape and re-use a copper washer.  But copper washers like cotter pins are so cheap and plentiful why not just buy a new one.  I guess if I was stranded in a desert I could use that information???