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bolt size and crush washer

Old 01-04-2010, 04:16 PM
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bolt size and crush washer

Ok the bolt I need to know the size of is the 6 bolts that hold on the sump cover that you must take off to get at the oil filter and drain plug.

*I went to sears and got a 12mm and it fit perfect, so thats taken care of. Just took a few trips.

Also where can I buy JUST a crush washer for the oil plug? autozone and checkers wants to sell me a whole new plug that comes with the washer and wont sell just the washers... Their computers dont even have 2009 rx8 parts listed in them, so they couldnt sell me a plug+washer like they initially told me. I remember reading about the honda s2000 crush washers fitting just fine so I got a 08 s2000 plug & washer and am just gonna throw away the plug I guess.

Also what size do I need so I can avoid the hassle of them not having it in their system, and just say "I need a xx size washer". I know the one I bought was called a 14-1.5, then another I have says 090-075.1(that was the plug+washer for a s2000). The only way I could get a washer separate was a nice guy at autozone that just popped open a drain plug package and gave me the washer.

I know a mazda dealership would have the washer, I would just prefer to avoid driving 25-30 miles to the nearest one when I should be able to go down to any store around here if I knew the correct size.

Thanks for any help, went up to the dealership today and they told me it would be $48.50 for an oil change lol, theres no way in hell I am paying that.

Last edited by xexok; 01-04-2010 at 08:26 PM.
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Old 01-05-2010, 02:14 AM
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Almost 40 views and not a single post.

I think the drain plug on the 09+ rx8s is different than the ones from 04-08, thats the reason I am asking this question. From what I have read in the DIY thread for oil changes and from searching people were saying it was different, so I figured it might also be a different size. If its the same size plug and washer then at least say so, if you know.

As I said autozone/checkers has 0 things in their system for 09 rx8s so they arnt able to help me.
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Old 01-05-2010, 02:24 AM
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go and do the oil change at the dealer go back the next day and tell them they forgot the o ring and thats it
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Old 01-05-2010, 02:45 AM
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First, if you did some searching you would of had some answers..

The Oil Drain Plug is different on 09's, it is a FLUSH recess type and you have to use an 8 mm Hex head long spanner tool to undo.

The plug washer though is the same a Series 1 RX-8's...but the plug is not...as I said.

I will take a pic and post for you..
The crush washer is Mazda Part Number 9956-41-400
Plug part number shown in Pic..
And I also showed my 8 mm Hex Tool to undo the Plug.

BTW: The Plug you have on your car is painted BLACK...the one I show here is my spare..

Attached Thumbnails bolt size and crush washer-drain-plug.jpg  

Last edited by ASH8; 01-05-2010 at 02:56 AM.
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Old 01-05-2010, 02:53 AM
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Originally Posted by sebarx8 View Post
go and do the oil change at the dealer go back the next day and tell them they forgot the o ring and thats it
no like I said I wouldnt pay $50 for an oil change, ever.

Ash I know its 8mm hex, the bolt I was asking about was for the sump cover and I figured that out myself, with 3 trips to sears.

All I needed to know was if the drain bolt on series 2 was a different diameter than series 1, and according to you its not so I can just ask for a washer/bolt from an 04-08 rx8 and be fine using just the washer.

Thank you for the pic and part number of washer.

Last edited by xexok; 01-05-2010 at 03:00 AM.
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Old 01-05-2010, 03:05 AM
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Yes, the drain plug washers are the same as S1 RX-8's, in fact the same washer is used in all Mazda's used over the past 40 years.
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Old 03-03-2019, 07:09 PM
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drain plug

Originally Posted by ASH8 View Post
Yes, the drain plug washers are the same as S1 RX-8's, in fact the same washer is used in all Mazda's used over the past 40 years.
Are the drain plugs the same size as the S-1, RX-8. not the washer but the plug that the 8MM key goes into. what is the thread size if you know. please and thank you.
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Old 03-04-2019, 03:13 PM
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I haven't measured the exact size, but they have a better design that uses a 17mm socket versus 8mm key, which was more prone to stripping.

Still have my old one sitting around so I could measure it when I get home.

Here are some pictures of them, along with the part number of the updated plug.
Attached Thumbnails bolt size and crush washer-img_20181104_140353-1280x960.jpg   bolt size and crush washer-img_20181104_214723-960x1280.jpg   bolt size and crush washer-img_20181104_145802-1280x960.jpg  

Last edited by UnknownJinX; 03-04-2019 at 03:17 PM.
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