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Easier Oil Change

DIY-Steve's Avatar

Join Date: Jan 2001
Posts: 173

10-22-01, 05:20 AM   #1  
Does anyone know the diameter and thread type of the oil drain plug on a Merc 3.0 Liter?

I have a houseboat and would like to run some copper pipe from the drain pan to a convenient location, so oil changes would be a lot easier.

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BoatMech's Avatar

Join Date: Dec 1999
Posts: 592

10-23-01, 02:41 PM   #2  
It depends on the year model. earlier were sae 7/16
and later models became metric 7x1.75mm i think.
Its a General motors Pan. There are some drain kits available and i would use one with a flexible line.

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