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Old 08-04-2022, 05:01 PM   #1
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2011 Chevy Workhorse 8.1 Drain Plug thread size?

Anyone know the thread size for a 2011 Chevy Workhorse 8.1 oil drain plug. Trying to order an oil drain valve for this engine and can't find the thread size. The bolt is 13mm but I'm told that is not the thread size.
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Old 08-04-2022, 05:04 PM   #2
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M12 X 1.75 drain plug
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Old 08-04-2022, 09:12 PM   #3
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Check your model year the 8.1L was discontinued in 2008, though I guess there is a chance some company had left over 2008 chassis and sold them as 2011 models.
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