Strange engine oil level readings

[mshac]

Thanks Kim. The rear engine is a TSIO-360CB-6B. The dipstick currently installed is a 632062-19 BK. Photo attached.

[Kim Geyer]

That should be the correct dipstick
What I do is after an engine change at the first oil change I’ll put in 8 quarts and scribe a mark On the dip stick. It is always 1/4 inch below the 8 mark on the stick. The pilots run the engines at the scribed mark and the engines don’t seem to blow any out. Then at oil changes I’ll put in 9 quarts and after the run up the level will be at my scribe mark. 1 qt. goes in the filter. It’s the same on all 5 of our 337’s

[n86121]

Years ago I drilled down on this: Why 12 qts when it is happy w 6?

For certification, the engines have a max allowable oil burn rate.

At that max allowable oil burn rate,
when the aircraft on its longest flight,
it must still land with enough minimum oil.

So the max endurance of the airplanes increases the oil requirement.

Ta da!