Moisture in rear engine oil

[Peyton]

Aircraft: 1967 Skymaster

Rear Engine: IO-360-C-1B SN:060635-R

Problem: High moisture levels in oil reported on last two oil analysis (Blackstone Labs).

Guys - This engine is five years old and has had oil analysis performed with each oil change. I have never had this problem before the last two oil changes.

I have a GEM 1200 and Shadin Fuel Fow installed and nothing unusual is showing up in the operating parameters and all numbers remain where they have been for the last five years. The only noticed change is possibly a very slight increase in oil temps and corresponding reduction in oil pressure (all remain well within the green).

I am the sole pilot of this aircraft and hours flown (130 / yr), power settings, etc are unchanged from past procdures. This engine is being flown at the same settings as the front engine which is not showing this moisture problem. The only difference in equipment between the two engines is the installation of an air oil separator on this rear engine which was done 4 years ago.

Can you please help with suggestions as to what might suddenly be causing this oil contamination problem?? What do we look for?

Peyton (peytonmcco@aol.com)