2013~2016 CX-5 Drain plug...Allen vs Hex

erhayes

Contributor
:
CX5 Reserve
I prefer the 8 mm internal allen bolt for the 2014 CX5 drain plug over the Hex bolt. I would like to know if they can be interchanged? Same thread and length? Ed
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
I prefer the 8 mm internal allen bolt for the 2014 CX5 drain plug over the Hex bolt. I would like to know if they can be interchanged? Same thread and length? Ed
Mazda switched unique 8 mm internal Allen drain bolt to standard 17 mm Hex drain bolt in 2018 MY when Mazda introduced cylinder deactivation with many changed on 2.5L. I believe the 2.5T received the same change in same 2018 MY on CX-9.

They both have good and bad for the application. IMO the reason why Mazda switched it is because internal Allen drain bolt is too easy to get rounded by those careless techs who seem to over-torque the drain bolt all the time.

Yes, both drain bolts are interchangeable.
 

njaremka

Wiggity-Wack-O-Tack
Contributor
:
2011 MX5 GT
As long as the part that threads into the drain pan is the same, and you can get a good seal with a new crush washer, you can put whatever you want in there.
 
:
Pueblo county CO
:
CX-5 Sport 16.5 6M
I also prefer the 8mm hex. It is easier for me to keep it from dropping into the drain pan.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
I prefer the 8 mm internal allen bolt for the 2014 CX5 drain plug over the Hex bolt. I would like to know if they can be interchanged? Same thread and length? Ed
You may have trouble to find 8 mm internal Alllen drain bolt right now as Mazda has switched to 17 mm flange Hex drain bolt for all engines. You’ll find the same part number, FS50-21-249, as the drain plug for ALL MY 2.5L and 2.5T’s. And it should be ended up with a Hex drain bolt, although the specific 17 mm flange Hex drain bolt used to use part number LFE5-10-404:

You can swap out the 8mm hex plug for a traditional socket head drain plug https://www.mazdaparts.org/mazda-oil-pan-plug-washer.html that maybe her dealer won't be able to screw up so easily.
Do not get this hex-head drain bolt P/N HE0310404-995641400 if you really want one:
genuine-mazda-oil-pan-plug-with-washer-15.jpg


It doesnt have flange which should have for a drain plug. Instead, get this hex-head drain bolt found on 2018 CX-5 2.5L and beyond with P/N LFE5-10-404:
⋯ the new oil plug for 2.5NA part no. if anybody is interested.
I got a spare just in case.

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20190212-190723-2.jpg
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
⋯ IMO the reason why Mazda switched it is because internal Allen drain bolt is too easy to get rounded by those careless techs who seem to over-torque the drain bolt all the time.
And here is an example:
My mom has a 2017 cx5 2.5 AWD. Its always had dealer oil changes for its entire life. This time she wanted me to change it for her. I go under the car and remove the little access panel and the 8mm hex plug is stripped so bad I cant remove it. I know how to get it off but it would possibly damage it and its Sunday and I dont have another one ready to replace it. Anyone know what to say to make the dealership fix this? Do you think theyll try to fight it?
 
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2018 CX-5 Sport
I was reading the forum before my first oil change and went and bought an 8mm hex/socket only to find out that the 2018 had a standard 17mm flange bolt which I was happy about.
 
Last edited:
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South Carolina
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12 MZ5 13 CX-5
And it should be ended up with a Hex drain bolt, although the specific 17 mm flange Hex drain bolt used to use part number LFE5-10-404:
yrwei52 is exactly correct. The updated part number to replace both the allen oil and aft drain plugs is indeed the hex LFE5-10-404. I've already swapped both of mine.

Oh, and don't forget to use a fresh crush washer every time! They're cheap, no excuse not to. I buy them a bag at a time, just to have them on hand.