Brass Plug?
I suspect the reason an aluminum plug is OEM is due to the thermal expansion qualities of aluminum. An aluminum plug will expand to a greater degree than brass when subjected to heat. Thereby, increasing the sealing qualities of the plug to motor and thereby helping to reduce seepage and/or leaks. Brass will not provide the same thermal dynamic qualities. Best to stay with the OEM aluminum style plug(s) and be mindful of the torque value for the plug. Always best to start with the minimum recommended torque. Drain plugs are not plugs one wants to be guessing "this is about tight enough" torque value. Or "its tight, but I'm going to snug it a little tighter for because tighter is better, right?" Nope! Over-tighten an aluminum plug and the thermal dynamic qualities come into play again and it will be impossible to remove the plug before stripping the 8mm hex key slot; as seen above.
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