I usually check it when I get fuel which is about every six days it doesn't burn or leak but its good habit. Ill fuel, pop hood, check, start car stand there and stare at running motor for a few seconds then get in and drive off. Almost once a week im under the hood poking at something so I usually pull the stick and look then too. I guess its a habit from working on old beater trucks. The other reason i look when fueling it to see if the filter has water in it. Clear filters are awesome.