Oil Level X 350

Depends on engine manufacturer. Kohler, Kawasaki, Honda all have the dipstick set on top of the threads. Briggs has you screw the dipstick down. I have come across a few Kaws and Kohlers were the instructions are to screw the cap on.
 
To check level screw the cap on. It is a minimal difference at best anyway.

Simple logic to me is: Does the engine run with the cap loose or the cap tight? Why would you check the oil with the cap loose?
 
To check level screw the cap on. It is a minimal difference at best anyway.

Simple logic to me is: Does the engine run with the cap loose or the cap tight? Why would you check the oil with the cap loose?
About 8 ounces different in fluid in most cases. And the engine manufacturer makes the decision to how the oil is checked for proper fill level.
 
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