Can I Use Transmission Fluid in Oil to Clean My Engine?
AMSOIL Engine & Transmission Flush helps to remove sludge and deposits from engines and transmissions.
Over time, engines can accumulate deposits that reduce power and performance. Since automatic transmission fluid contains detergents to clean sludge, some DIYers add a small amount of transmission fluid in their oil to clean the engine prior to oil changes.
ATF, however, is not formulated for use in automotive engines. Instead, a product that’s designed to flush engines is a far-superior approach.
How Sludge Forms
Stop-and-go driving, prolonged idling, trips too short for the engine to reach full operating temperature, towing, the ingestion of airborne dirt, fuel dilution, water condensation and oxidized oil all can promote sludge build-up in motor oil and transmission fluid.
Transmission Fluid In Oil Reduces Cleaning Power
In most cases, adding automatic transmission fluid to motor oil reduces cleaning power. That’s because the detergency of ATF is less than motor oil. Why is that?
ATF is exposed to lower levels of combustion byproducts and contaminants than motor oil, so it is formulated with reduced detergency. Instead, ATFs have elevated levels of friction modifiers and other additives that help protect gears and clutches.
Transmission Fluid In Oil Reduces Wear Protection
Second, adding ATF alters the motor oil formulation and reduces its effectiveness.
A good motor oil is a fine balance of base oils and additives designed to fight wear, reduce friction, prevent deposits and slowly dissolve accumulated sludge. The cleaning power of motor oil is designed to work gradually over subsequent oil changes and not necessarily all at once. Adding a foreign substance to the oil disrupts the formulated chemistry, negatively impacting wear protection, detergency and more.
Changes Motor Oil Viscosity
Finally, ATF can alter the viscosity of the oil, reducing wear protection.
Viscosity is the oil’s most important property, influencing wear protection and fuel efficiency. Increasing or decreasing viscosity by adding a little transmission fluid in oil to clean sludge can lead to increased engine wear.
Use An Engine Flush Instead
If you want effective sludge removal and cleaning power, we recommend using AMSOIL Engine & Transmission Flush. It helps to restore fuel economy, increase operating efficiency and reduce emissions in gasoline and diesel engines, and automatic transmissions. Its potent, detergent-based formula cleans sludge and deposit build-up.
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AMSOIL Engine & Transmission Flush
Prepares engines and transmissions for new oil
Removes deposits and sludge for improved efficiency, fuel economy and lower emissions
Prolongs vehicle life
Detergent-based formula is environmentally friendly
Compatible with seals and gaskets
Works in one treatment
Easily disposed of with waste oil
Benefits For Gasoline And Diesel Engines
Helps loosen sticky valves and rings, minimizing blow-by and reducing emissions
Helps quiet lifter noise
Promotes lower operating temperatures through sludge removal
Benefits For Automatic Transmissions
Cleans deposits in oil cooler and ports
Helps unclog fluid passages
Cleans deposits and varnish from clutch plates, helping improve efficiency
Promotes smoother operation and transmission life through reduced shift delay