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So, is it 17mm or bigger, like 22?
The dearth of service manuals for the straight-6 causes me to resort to Chilton's which says, "Most Volvos have a 17mm head on oil pan plugs." It also says that the transmission is a 22mm head bolt.
The bolt head on what looks to be the engine pan is much larger than 17mm. Axis of the bolt is horizontal, face of the bolt head is towards the rear, dead center of the pan, dead center of the car. It's located roughly under the transmission bellhousing.
I just don't want to inadvertently dump the ATF on an oil change.
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