While I was at a car dealership this week, I was letting the salesman drive my truck around so he could give me a trade-in value. I told him all the fluids were changed recently except the trans...and then came the good news! He told me that you never have to change the oil in a manual transmission! Since they are totally sealed, no water can contaminate the oil, and since no combustion takes place in there, there is no carbon buildup. He also said that since it's not hydraulic fluid like in an auto, there is no heat buildup to break down the oil either. Man, this will come as great news to all the millions of drivers who change theirs at regular intervals. Pass it on!