Oil pan hole

I-AM-JD

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Jan 7, 2020
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Everyone I have a question I have a 1980 Buick Regal 3.8 L and oil pan has a hole that's not threaded and is not drain plug hole can anybody enlighten me on what this hole is for? I appreciate it thanks.
 

ssn696

Living in the Past
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Jul 19, 2009
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Is it reinforced around the hole? I've seen 1987+ SBC oil pans with a hole about halfway up from the sump for a level sensor. If it's reinforced, you can see if it is close to a tapped hole size and fit it with a plug.

Or, add a turbo kit to the engine and use this hole for the turbo oil return line!
 

I-AM-JD

Apprentice
Thread starter
Jan 7, 2020
50
8

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I-AM-JD

Apprentice
Thread starter
Jan 7, 2020
50
8
Is it reinforced around the hole? I've seen 1987+ SBC oil pans with a hole about halfway up from the sump for a level sensor. If it's reinforced, you can see if it is close to a tapped hole size and fit it with a plug.

Or, add a turbo kit to the engine and use this hole for the turbo oil return line!
So it's on the bottom of the oil pan that's not threaded or reinforced occasionally it does leak. do you think I should plug it? I was going to but I didn't know if it was supposed to remain open like that.
 

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500/600

Royal Smart Person
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Nov 17, 2018
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West Virginia
I’d leave it open.
 
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