Data point for the record. Photo below is a standard Lycoming o-360 (updraft sump for a carb), looking in past the #4 rod. The slots in the bottom of the case lead down into the sump; they are the oil drains. Here the sump is completely full to the top of the slots. With longerons level, the supplied dipstick indicates approximately 7.5 quarts.
![O360 updraft.jpg O360 updraft.jpg](https://vansairforce.net/data/attachments/48/48239-24ea03eed48d249436239fd6531e81f5.jpg)
BTW, with longerons level, 7.5 qts is below the rear prop governor drive gear. However, I'm pretty sure this gear is spinning semi-submerged when the tailwheel is down. Borescope through the rear case web into the accessory case:
![O360 Governor Gear 7.5 qts.jpg O360 Governor Gear 7.5 qts.jpg](https://vansairforce.net/data/attachments/48/48256-3af4036d48e66b839b442d38b1d03226.jpg)
![O360 updraft.jpg O360 updraft.jpg](https://vansairforce.net/data/attachments/48/48239-24ea03eed48d249436239fd6531e81f5.jpg)
BTW, with longerons level, 7.5 qts is below the rear prop governor drive gear. However, I'm pretty sure this gear is spinning semi-submerged when the tailwheel is down. Borescope through the rear case web into the accessory case:
![O360 Governor Gear 7.5 qts.jpg O360 Governor Gear 7.5 qts.jpg](https://vansairforce.net/data/attachments/48/48256-3af4036d48e66b839b442d38b1d03226.jpg)
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