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Discussion Starter #1 (Edited)
Are the tranny and oil pan used the same thread size, the 14mm-1.5 if so the tranny plug does it really have to be the big 24mm head bolt size or can I've used the same thread but have the head bolt smaller. Thks
 

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Does Kia have a mag drain plug for engine oil...I don't have faith in the after-market crap out there! Thnx!
 

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m14 for the oil pan and m18 for the automatic transmission drain... I believe both were 1.5 pitch.

Aluminum drainplugs could strip after multiple usages, like the oil drain plug. I do NOT recommend aluminum drainplugs. I've seen plenty stripped Mishimoto, Greddy, and fancy anodized aluminum krap plugs. A quality calibrated torque wrench should be used and plug threads inspected at each removal.

GoldPlug, Powerslutracing, Dorman/Needa, and DimplePlug have excellent magnetic drainplugs, which are higher quality than the OE Hyundai/Kia plugs.

18mm or m18 - 1.5 transmission/differential drainplug is same size as what some Toyotas and Hondas use in some of their gearboxes. Magnetic drainplugs are available in various head bolt sizes. Toyota uses the same 24mm socket size and also 10mm Allen wrench size. Honda, my preferred plug, uses a 3/8 square(ratchet with no socket needed). And, DimplePlug/GoldPlug have a smaller sized head available if you don't want that pathetic OE transmission 24mm easy to strip barely thick enough transmission drain plug.

https://www.hyundaipartsdeal.com/genuine/hyundai-plug-magnet~0k95b-27121.html
https://www.hyundaipartsdeal.com/genuine/hyundai-plug-magnet~45324-23000.html

Even the local autoparts stores sell magnetic dorman/needa/oiltite 14mm oil drain plugs and the transmission/gearbox m18, if Goldplug/Dimpleplug is not in your budget.
 

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The big problem with the OE drain plugs for the trans is the head is not 24mm. A 15/16" socket fits perfect but the 24mm is too big and will mess up the thin head on the plug if you are not careful.
 

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Discussion Starter #7
They reason I ask was since I've add the EZ oil drain with the L adapter and was going to do one for my tranny, but using a straight adapter. Just like these photos. I'm doing this route is because as you can see in the photo it's much easier and it won't give you the oil spelled. I'm asking because I need to know the thread for the tranny so I can get one with the straight. Since our sonata has the under belly protection or under belly skip plate, this will not be in No Danger
 

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The thread pitch on the 24mm hex head plug is a 18mm x 1.50.

Same as an O2 sensor FWIW.... Just had to buy a thread tap for one.
 

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I have a rant over...

...Hyundai using 16mm for the drain plug! I have 3 metric sets, none of which contain a 16! :rant2: The best sub I found was a 6-point 11/16 socket from an old Husky set.
 

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...found another metric set (in the basement shop) NO 16mm! Can I buy a 17mm plug for the Sonata...too much of a thread-stripping hazard...15mm?
 

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...so most likely the thread would be the same. :shades:
 

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5 Acura & Honda Oil Drain Plugs M14-1.5 17mm Hex

[ame]https://www.amazon.com/Acura-Honda-Drain-Plugs-M14-1-5/dp/B0040D0IRS[/ame]
 

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5/8 is a bad fit, 11/16 works better, but not the best.
 

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I just don't understand what the problem is.... either buy the new socket or buy a fancy drain plug? Its just not important to dwell on something so simple.

Oil pan:
https://www.drainplugmagnets.com/hyundaikia.php
https://goldplug.com/shop/mp02/
https://goldplug.com/shop/mp02t/
https://goldplug.com/shop/ap08/

I like that goldplug offers the M14-1.5 with various socket hex heads on their magnetic drainplugs.

A 16mm socket is <$10 at local store for those generic drain plugs.
https://www.lowes.com/pd/Kobalt-Metric-3-8-in-Drive-6-point-16mm-Shallow-Socket/1000802084
https://www.homedepot.com/p/Husky-3...nt-Metric-Standard-Socket-H3D6P16MM/202913509
 
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All I can say is it's 17mm from the factory.
So, they just singled me out for the 16 and they are all listed as 16mm? I have a 16mm socket now but in 4 sets I have, old and new, there is no 16. :angry:
 
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