Hmmm... usually red fluid is what you put in an automatic transmission. I haven't seen any red fluid for a manual yet. Maybe someone put the wrong gear lube in the tranny, and it's too thin? I don't know exactly. Maybe I'm wrong but I haven't seen red for manual yet. Othwise my 78 F250 has a manual transmission, and it's always leaky. I guess the best thing to do would just be to check the level every once in a while. Just take off the fill plug and stick your finger in there and see how much is in there. I don't know how much I've helped, but hopefully something will come up. I'd kind of like to know too, because mine leaks too.