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What size is pan oil drain bolt?

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Old 04-01-2005, 12:38 PM
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What size is pan oil drain bolt?

I'm going to pick up a spare oil drain plug and fit it as a return from a bypass filter but I don't know the exact size/thread to pick up. Anybody Know?
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Old 04-01-2005, 01:53 PM
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Re: What size is pan oil drain bolt?

It takes a 15mm wrench/socket, if that helps at all?? I couldn't tell ya the actual size of the bolt?
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Old 04-01-2005, 02:10 PM
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Re: What size is pan oil drain bolt?

The threads are ½-20.
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Old 04-01-2005, 02:18 PM
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Re: What size is pan oil drain bolt?

14mm on LT1 cars
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Old 04-03-2005, 01:33 PM
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Re: What size is pan oil drain bolt?

Go to a car store, they can look them up and sell them, well they were able to for my 94 3.4L.
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Old 06-21-2005, 07:44 AM
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Re: What size is pan oil drain bolt?

Now that I finally know the answer to this question, I'll pass it on. 12mm x 1.25. As it turns out 1997 is the first year for this from the previous 1/2 x 20 and it stayed the same through 2000.
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Old 06-21-2005, 08:20 AM
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Re: What size is pan oil drain bolt?

Originally Posted by JohnD
Now that I finally know the answer to this question, I'll pass it on. 12mm x 1.25. As it turns out 1997 is the first year for this from the previous 1/2 x 20 and it stayed the same through 2000.
Looks like the change to the metric plug was made during the 1997 model year, so it could have had either one.
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Old 06-21-2005, 11:31 AM
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Re: What size is pan oil drain bolt?

I like it when everybody is right!
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Old 06-21-2005, 01:11 PM
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Re: What size is pan oil drain bolt?

Originally Posted by JohnD
I like it when everybody is right!
That does not happen very often.
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