Unlike engine oil, which is changed frequently, transmission fluid is often overlooked until a problem arises. Consult your vehicle’s service manual to locate the filter and understand the replacement procedure.
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In manual transmissions, it primarily serves as a lubricant for the gears and bearings. Remove the old filter and replace it with a new one, applying a small amount of fresh transmission fluid to the gasket on the new filter to ensure a proper seal.
Over time, however, it breaks down, collects metal shavings, and loses its viscosity, leading to rough shifting, overheating, and ultimately, expensive repairs. This step requires a bit more care, as the pan gasket can be fragile.
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This is also the perfect opportunity to inspect the gasket for cracks or signs of hardening and to clean the pan thoroughly to remove any residual sludge or debris that could contaminate the new fluid. In automatic transmissions, it acts as a hydraulic fluid, transferring power from the engine to the gears.
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More perspective on How to change transmission oil can make the topic easier to follow by connecting earlier points with a few simple takeaways.