Freightliner Special Oil Pan Plug

All I know is don’t F it up. It’s not an easy fix

 

Spring and ball sounds like someone installed aftermarket valve for easier drain or because they didn’t want to remove drain plug every time…. Try google search to find the type that you have…
I know in my truck I have a fitting that I screw into the drain plug and it releases the valve and the oil drains

 

At the shop we would have big fleet trucks that came in that had a type of quick drain installed. We didn't have that system so we just removed the quick drain just like you removed a drain plug. The most common type could be removed with a shallow 1-1/2" socket if you removed the dust cap first.

 

It’s just a aftermarket quick drain plug. There’s a couple different brands, and a couple different configurations. Each one is engine brand specific. Mine has a nipple, I keep it capped and put a hose on it when draining oil. Comes in handy when changing your own oil. Draining it directly into empty jugs. Old DPF 2.5 gallon jugs work great. The valves are available at some Dealerships. Im sure you can find them online easily. My guess is a trip to the plumbing dept at your local hardware store with the valve in hand, you cam find a nipple and piece of hose to fit it.