counter rotating engine lower unit oil always dirty?

[straycatboat]

I have 2 DF 250's , 1 is C/R
The lube oil in the C/R is always dirty black when I change it at 100 hrs.
The std rotation engine is always perfectly clean.
Do I have an issue with the C/R engine lower unit?
Its always this way when I changed the oil.

[Solarman]

df250's, lower unit oil black

Think I would ask your dealer this question, and let them know you're very concerned. Dark lube after 100 hours doesn't sound good at all.
Let us know what they say, good luck.

[artdf175]

is this unit using oil, more so than the other where the oil stays clean?