Color of gear oil from lower unit

[AQUADJ]

I have twin 1998 Yamaha 250hp ox66 EFI motors. Today I drained the gear oil from both lower units and 2 completely different color oils came out. The starboard was yellow - green and slightly creamy similiar to the new Yamaha gear oil. The port (counter rotating ?) was black. The main bearing went on the port motor and I had a new power head replaced in August. Could that have anything to do with it?

 

[WillyBWright]

Re: Color of gear oil from lower unit

Hopefully the gearlube was changed at the same time, but maybe one had oldeer lube than the other. Black is a sign of age and a lot of use, or of a bearing running too hot. Creamy is usually a sign of a leaky seal allowing water to get in. Or it could just be a bad level or fill/drain plug gasket. Creamy could also just be a bit of foam from running recently.