Transmission fluid goes into the transmission, specifically through a dipstick tube (for most cars with automatic transmissions) or a fill plug on the side of the transmission housing (common for manual transmissions and some automatics). It is crucial to use the correct fluid type and not to overfill the system.
The transmission is the component that transfers power from the engine to the wheels. The fluid serves multiple critical functions: it acts as a hydraulic fluid to create pressure for gear shifts, a lubricant to prevent wear on internal parts, and a coolant to manage the heat generated by operation. In an automatic transmission, you'll typically find a dipstick, similar to the engine oil dipstick, located near the back of the engine bay. The fluid is added through this tube. For many manual transmissions and some modern automatics that omit a dipstick, there is a fill plug on the transmission case itself. The car must be level, and the fluid is added until it begins to seep out of this fill hole.
| Transmission Type | Common Fill Location | Key Consideration | Typical Fluid Capacity (Quarts) | Check Procedure |
|---|
| Automatic (with dipstick) | Dipstick Tube | Engine should be running, transmission warm, and in Park. | 6-14 quarts | Check marks on dipstick |
| Automatic (sealed/no dipstick) | Fill Plug on case | Requires a lift; fluid must be at a specific temperature. | 7-12 quarts | Scan tool to check temp; fluid drips from check plug |
| Manual | Fill Plug on case | Car must be perfectly level. | 2-3 quarts | Fluid reaches bottom of fill plug hole |
Using the wrong fluid can cause severe damage, including slippage and premature failure. Always consult your owner's manual for the specific procedure and recommended fluid specification for your vehicle. If you're unsure, having a professional handle the service is the safest bet.
