2011 Buick Lucern Owner's Manual - Page 310

To reinstall the cover: 1. Align the two hinges located on the inboard side of the cover. 2. Push the cover slightly down and towards the engine to engage the tabs in the hinges and align the two screws. 3. Tighten the two screws on the top of the engine air cleaner/filter cover. Automatic Transmission Fluid When to Check and Change Automatic Transmission Fluid A good time to check the automatic transmission fluid level is when the engine oil is changed. Change the fluid and filter at the intervals listed in Scheduled Maintenance on page 7 ‑ 3 and be sure to use the transmission fluid listed in Recommended Fluids and Lubricants on page 7‑8. { WARNING: Operating the engine with the air cleaner/filter off can cause you or others to be burned. The air cleaner not only cleans the air; it helps to stop flames if the engine backfires. Use caution when working on the engine and do not drive with the air cleaner/filter off. Notice: If the air cleaner/filter is off, dirt can easily get into the engine, which could damage it. Always have the air cleaner/filter in place when you are driving. How to Check Automatic Transmission Fluid (3.9L Engine) Because this operation can be a little difficult, you may choose to have this done at the dealer service department. If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick. Notice: Too much or too little fluid can damage the transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Too little fluid could cause the transmission to overheat. Be sure to get an accurate reading if checking the transmission fluid. 6-24