Dzus (pronounced Zeus) is a commom quick release non structural aviation fastener used on plates that are often remove. There are numerous options so you have to look at a application chart. On my car the stud retaining rings were missing so the studs would fall out when released but I had some.
Note the grip length of the stud may vary due to thickness of the material being fastened so you have to pay attention to stud location. Light pressure and a quarter turn should engage / release it. If not chances are the stud is too short. When properly installed they work great.
Aircraft Spruce usually has a good selection and the needed app. Chart. Not too expensive .
The thing that slightly annoys me is that I have to remove the tub to check the oil level.