No dipstick="sealed" and it has to be added in through a fill plug on the side of the transmission. Easiest thing to do is get something to measure what came out and pump it back in with a cheap $10 bottle pump found at Wal-Mart or any parts store usually. They're used to refill boat motors most of the time. Its supposed to be a certain temp, but you have to follow a process to put the transmission into check mode without the techstream software. It's a pain. Just measure what you drained and pump new back in and consider it a drain and fill.