Oil Spray Coming Out Filler Tube Cap on Briggs
I have a 17.5hp ELS500 Briggs engine on a Simplicity rider. Everything seems to run fine, but there is a small spray of oil that comes out the filler tube cap. See attached picture. The engine starts right up, runs fine, and does not blow any smoke. No oil appears near the air filter. The oil does not appear to have any gas in it or the oil is not over-filled. I have changed the oil and filter. How do I methodically nail down the issue from most simplist to complex, as I read it could be a number of issues that cause this?
The engine is Model 31L777, Type 0036, Trim E1.
Thanks for any help.