Kaline

OK, 394ci newbie here. I went to drain the oil on my 1964 Dynamic 88 today (low compression 2bbl 394ci V8) and the drain plug appears to be an internal octagon with points, kinda like a female Torx socket but with 8 points instead of 6. I have never seen a drain plug like this. Is there a special tool for this? Do all the 394ci use this? Of course, my 1964 Oldsmobile service manual does not say anything about a special socket. Any help is appreciated!

J-(Chicago)

Sounds like a socket for Square shaped nuts would work. Most standard nuts are 6 point, but they make 12 point sockets. I assume the same idea applies here to the old school square ones.

Kaline

Whew! Thanks Chuck. I freaked when I saw the drain plug, and did not have a 1/2" drive with me (I'm storing the car in a friend's garage). I'll take my 1/2" ratchet and an extension with me the next time I go work on it and get the oil changed. I'm determined to have the car safely on the road by May: it's not been registered since around 1990!

rocketraider

Use the ratchet WITHOUT the extension. Extensions tend to slip in the recess and round off the points, creating a whole 'nother problem which believe me you do not want to deal with.

I have one of the tools, but the ratchet works just as good and don't have to dig out (read hunt for) another tool.

Olds used that style drain plug thru 1967. My buddy freaked the first time he tried to change oil in his 66 Starfire. He's a Pontiac guy and had never seen anything like it. Told him welcome to Oldsworld...

Olds64

I always use a large cresent wrench when I change the oil in my 64 98. Actually, I think the plug on my car is so worn a metric socket fits over it nicely. I want to say it is a 32 or 34mm socket. I can't remember exactly. I know it is one of the biggest metric sockets I have.

59-59-59

Well this is your once every 3 years you'll find it on Ebay.. Check out auction 270222401606..$25 + $10 shipping = ripoff when you can do the same exact thing with a ratchet.. Its funny cause every '59 and '60 394 block I have takes a conventional 5/8 ( i think ) nut. I wonder what mental midget made the change to the later 394 oil plugs

joe_padavano

I was going to add that I often see these tools at Carlisle. There are several vendors who regularly have boxes full of old KD tools and usually several of these drain plug tools are in there if you look. $2 seems to be the going rate.

gerlof_1

just welded a bolt head on it,works also.

Kahuna

I have the same tool as 'Oldsfan' and it works just great (actually, I have two of them). They're hard to come by, so grab one when you can.

JoeyDiesel027

Me too just now wow it blow my mind . wasn't expecting this...

JoeyDiesel027

Weld moron ,spell or try to say it right if your not gonna help then step hick...again MORON

joe_padavano

You do realize that post is from 2008, right?

As for the drain plug, it's actually a double 1/2" square drive. It's like the triplesquare fasteners used by Audi and VW, but it's "doublesquare". You can use a 1/2" extension in the recess and it works fine. You can also use the correct tool if you want. KD 413 is one of them.

CANADIANOLDS

This is fantastic,, Freaking about spelling something wrong which wasn’t spelled wrong, while himself making a bunch of spelling mistakes…🤣🤣🤣🤣

herkguy

Free entertainment 😬

coldwar

And this one. I have a number of these and they come up for sale now and again. 1/2" drive: