If your owner's manual recommends an additive:
1. Locate the transmission dipstick: The location varies depending on the vehicle, but it's usually near the engine, often marked with a transmission symbol. Your owner's manual will show you exactly where to find it.
2. Check the transmission fluid level: Remove the dipstick, wipe it clean, and reinsert it fully. Remove it again and check the fluid level against the markings on the dipstick. This is crucial to avoid overfilling.
3. Warm up the transmission: Run the engine and allow the transmission fluid to reach its operating temperature. This usually takes 10-15 minutes of driving. A cold transmission will not give an accurate reading.
4. Prepare the additive: Follow the instructions on the additive bottle carefully. Some may require shaking before use.
5. Add the additive: With the engine OFF, carefully pour the recommended amount of additive into the transmission fluid through the dipstick tube. Do NOT overfill.
6. Recheck the fluid level: After adding the additive, check the fluid level again using the dipstick. Top off with the correct type of transmission fluid if necessary. Your owner's manual will specify the correct type.
7. Run the engine: Run the engine for a few minutes to allow the additive to circulate.
Important Considerations:
* Wrong additive: Using the wrong type of additive can severely damage your transmission. Only use the type and amount recommended by your owner's manual or a qualified mechanic.
* Overfilling: Overfilling your transmission is just as bad as underfilling. It can cause damage to seals and other components.
* Mechanic's advice: If you're unsure about anything, take your vehicle to a qualified mechanic. They can diagnose any transmission issues and advise you on the appropriate course of action. Adding an additive without knowing the cause of a problem could mask a more serious issue.
In most cases, modern automatic transmissions don't require additives unless there's a specific problem. If you're experiencing transmission problems (slipping, hard shifting, etc.), see a mechanic for diagnosis and repair instead of resorting to additives as a first solution.
