I first purchased a 1993 Suzuki Sidekick with 150K on it and changed the manual transmission oil for the first time then. After another 75K I‘ve changed it again but this time an obvious 2 ounces of water drained out first, followed by the fluid, which was milky like you‘d see if you get water in your engine oil.The transmission hasn‘t made any odd noises so it may be OK but how can water get into a manual transmission?
no hoses to the standard transmission. as in old man dirt he's right
Might be from leaking trans fluid hoses, etc, around a leaky radiator. Some auto trans vehicles have the trans fluid cooled by using the radiator, maybe some manual trans, too. Check those hoses, a '93 150k would be at risk for for radiator/trans hose leaks.
The transmission is vented, allowing in air when it cools down and air to get out when it is hot. This air can have moisture in it that condenses. Also if the car is driven through high water it can get in. As the transmission and oil heats up it should get the water out due to the operating temperature of the oil and the emulsifiers used in most transmission oils. So the transmission should be alright.
