Today, I was driving my beloved Subaru "BumbleBeast" doing my usual daily errands, when I noticed that the GearBox was noisier than it used to be; despite that somehow it always has been noisy when I left the gas pedal only; but now, besides that such described noise is louder, it also developed a New noise that sounded like a fast little gear, almost similar to a turbo whistle, but coming from inside the GearBox; that fast pitch noise is mainly noticeable during acceleration on Second Gear.
So, I came home to lunch, and right after that, when the Drivetrain cooled down, I went to check the dipstick on the GearBox, and it came out dripping dark fluid, it showed oil up to the full mark, then such oil was covered with something that seemed to be Water, whose mark went up more than Twice on the Dipstick, than the oily full mark.
I did the old paper napkin Test: Let a drop from the dipstick to drip directly on a clean paper napkin, and the oil mark stayed dark and solid in the center, and a surrounding ring of wetness grown around: thus usually means Water in Oil.
I have been with this Subie for the last thirty years and never experienced such a thing, nor in any other car, so I wonder...
► How the Heck, water found its way inside the GearBox?
► Or could this be some sort of moisture buildup?
Please let me know your experiences with this issue / similar issues, the possible causes and ways to avoid it from happening again.
I check the fluids on my cars on a weekly basis, it was alright; and the last time I went driving on a pond, was ~ a year ago; also I've not washed the engine in around two years...
For those who don't Know, my Subie is a 1985 GL wagon with its original EA82 engine and 5MT GearBox, runs with a 2" Lift + 25" tires.