When I changed the oil in my Z i didnt realize i needed to change out the crush washer but everything looked fine when i pulled it out aty the time and just put it back in. My car hasnt leaked/lost any oil in the month ive since changed it. Is this really necessary to change it if it isnt scarred or anything?

 

I've changed my oil four times already, and I haven't changed out the washer yet (although I do have five new washers readily available). No leaks so far. I usually change the washer every 5 changes... have done that with all my cars. FWIW