My laundry room dryer outlet is currently wired with a 50 amp 3-prong outlet, but has a 30-amp breaker on the main panel. I've been using the dryer in this outlet just fine for a year after moving in with a 3-prong 50 amp cord I connected to the dryer. My understanding is that these are typically used just for electric oven ranges. (Example of current outlet here: https://www.homedepot.com/p/Leviton-50-Amp-125-250-Volt-Shallow-Flush-Mounted-Single-Outlet-Black-R30-05206-S10/302480499)
EDIT: Based on updated photos, looks like I have L1, L2, N, and G to wire into a new 30a 4-prong outlet. In my exisitng outlet ground and neutral are wired together.
Is it okay to leave this in place? I know this no longer the practice for new work. I am about to buy a longer cord for my dryer, and was going to buy the same 50 amp 3 prong cord. The price difference for the 50 amp cord is minimal, so I'd rather leave this outlet in place.
Or, should I just replace this outlet with a new 30 amp outlet? If I do use a new 30 amp outlet instead, should I be using a 3 or 4 prong style? Is the dryer dependent, and wiring dependent? If I do replace the 50a outlet, it seems like I should be replacing the 3-prong outlet at 50 amps with a new 3-prong outlet at 30 amps.
Example of 30 3-prong I would purchase: https://www.homedepot.com/p/Leviton-30-Amp-125-Volt-250-Volt-Shallow-Single-Flush-Mounted-Outlet-Black-R30-05207-S10/302480849