As transmission oil temperature increases, what happens to the oil level?

• A. It lowers the oil level
• B. It raises the oil level
• C. There is no change in the oil level
• D. None of the above

Answer: (B)

When transmission oil heats up, it expands. As the temperature rises, the oil’s volume increases, so more oil occupies the same space in the pan and dipstick tube. That expansion makes the level reading on the dipstick rise. So the oil level appears higher as the oil gets hotter. (That’s also why technicians check the level within a specified operating temperature range—cold readings can be lower, hot readings higher.)