I've had cars for years and never replaced the oil drain plug washers. Sometimes they got paper thin after lots of changes, but never had a leak.

I eventually did start replacing washers, but that was when I started to buy filters from dealers rather than K-mart, and they'd include the washers for maybe a quarter apiece. So I now have a box full of washers only used once. If they match the size needed here, I'll be happy to let them go for half the dealer prices quoted here.

Ken

 

Mazda dealer was a great deal on the crush washers for the differential and MT fluid drain and fill bolts. The new part # for the non-copper ones are correct above and I added proof of the cost and part number:


Diff and tranny crush washers for 2010 GT.

 

updated part number - alpha 601 17-117 from what my dealer told me today when i gave them the part number = y601-17-361.

 

you just need to figure out the ID/OD and buy them for pennies almost anywhere.

 

or just use my logic - the savings I amass by changing the MT fluid and Diff fluid myself makes the $4-6 price tag for washers that much sweeter. Mazda's crush washer crush quite well and seal EVERY TIME. Try that on a SARS-CoV-2 laden $0.35 part from somewhere else that's harder and may not seal every time and starts leaking when you head out on a 800 mile trip to DGRR.

 

ok Mr. Spock