Make sure its oil as well sometimes the power steering hoses ,o rings can leak a bit and come down the motor mixing with grimes and oils along the way to make it look like oil,can also check around the transmission side of the pan to make sure its not trany fluid . Not sure but sometimes I find things that have happened like this and it tries to make you think its something else when its not. Example....that Rattle noise ...pulley nope...tensensor....nope......compressor nope....power steering nope..... oh its the alternator going bad found it.....how many parts did you replace after that 🤔