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The 2007 Buick LaCrosse needs DEXRON-Vi Automatic transmission fluid. The 4T65-E automatic transmission in it has an initial fill capacity of 7.4 quarts and a total fill capacity of 13.4 quarts. The specific transmission filter WIX58837 should be used. Buick suggests changing the transmission fluid every 25,000 to 40,000 miles to prevent breakdowns. It is important to monitor the fluid level regularly for leaks, as even a small leak can cause significant damage to the transmission. Keeping up with proactive maintenance on all components, including the transmission, is crucial for the longevity of your '07 LaCrosse, especially as it approaches classic status!
I suggest using Amsoil OE Fuel-Efficient Synthetic Automatic Transmission Fluid with code OTLQT-EA. Remember that ATF can be hazardous, so exercise caution when handling it.