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Tag Archive for: hydrostatic transmission oil

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Motor Oil Or A Specific Hydrostatic Transmission Fluid In Zero-Turn Mower?

AMSOIL Product Applications, Tech Discussion

Many mower manufacturers will allow the use of 20W-50 motor oil in their transmissions. While motor oil will work in many hydrostatic transmissions, there is a better option.

There’s no question that motor oil will capably work in mower hydrostatic transmissions. The mower will steer and it will be propelled forward and backward. But there are vital differences in the way that motor oil is formulated compared to dedicated hydrostatic transmission fluid. These differences can play a role in long term performance and component life.

The main factor to consider is that motor oil is designed for a completely different operating environment than hydrostatic transmission oil. Engine oils are formulated to deal with combustion and combustion by-products. There are very specific detergents and additives in motor oil that won’t affect performance or protection over the short term. But over time, these motor oil ingredients will limit the oil change interval and this can have an effect on long term component life.

The detergent ingredients in motor oil hold combustion by-products in suspension and prevent deposit formation. These ingredients are vital in an internal combustion engine. But not only are these ingredients not needed in a hydrostatic mower transmission, they can degrade and shear down over time. These degraded detergents can contribute to oil foaming, which can lead to compromised wear control.

AMSOIL 20W-50 Synthetic Zero-Turn Hydrostatic Transmission FluidAnother advantage that a dedicated hydrostatic transmission oil has over motor oil is the ability to fight oxidation and corrosion. The hallmark of a good hydraulic fluid is oxidative stability and strong anti-corrosion chemistry. These attributes lead to longer service life and improved protection during storage.

Hydrostatic transmissions also have gears. The meshing of gears can shear down and thin out engines oils. Hydrostatic transmission oil is designed to withstand gear lubrication to a much greater extent than motor oil. This means that dedicated transmission oil has a superior ability to maintain its original viscosity and provide more reliable wear protection over the long term.

Conclusion

There’s no question that motor oil will work in mower hydrostatic transmissions that allow its use. But a dedicated hydrostatic transmission oil contains specific anti-foaming, anti-rust, anti-oxidation and anti-wear ingredients. This chemistry will allow for much longer service life, consistent performance and maximized transmission life. We recommend the new AMSOIL 20W-50 Zero-Turn Synthetic Hydrostatic Transmission Fluid.

April 8, 2017/by Marc Roden

New AMSOIL Small Engine Oils And Zero-Turn Hydrostatic Transmission Fluid

New AMSOIL Products

AMSOIL is about to release a new line of synthetic motor oils for small/utility 4-stroke engines and and transmission oil for zero-turn mowers. Here are the new products.

  • 10W-30 Synthetic Small-Engine Oil
  • 10W-40 Synthetic Small-Engine Oil
  • 20W-50 Zero-Turn Synthetic Hydrostatic Transmission Fluid

AMSOIL Small Engine Oil and Zero Turn Hydro-Transmission Oil

These products will be available on March 6th, 2017. They are ideal for home owners, lawn care pros, farmers and small engine shops. Contact us for wholesale pricing using the form on this page.

About AMSOIL 10W-30 Synthetic Small-Engine Oil

This new 10W-30 Small Engine Oil will be replacing the AMSOIL Synthetic 10W-30/SAE 30 Small Engine Oil. As the new 10W-30 Small Engine Oil will simply be a repackaged version of 10W-30/SAE 30 Small Engine Oil, there is much we can tell you about it.

  • Suitable for any gasoline or diesel-powered small engine.
  • Can be used where 5W-30, SAE 30 or 10W-30 motor oil is suggested
  • Far more robust formula than automotive engine oils
  • Pours down to -40 for year-round service
  • Formulated for extended oil change intervals
  • Contains powerful anti-rust/corrosion chemistry
  • Has a strong resistance to thinning out or boiling off
  • Wet clutch compatible making it suitable for transmissions requiring a 30-weight oil
  • Suitable for a wide variety of engine types from mowers to pumps to snow blowers

Simply put, if it has a small engine, AMSOIL 10W-30 Synthetic Small-Engine Oil will provide ironclad protection.

About AMSOIL 10W-40 Synthetic Small-Engine Oil

We expect that the 10W-40 Synthetic Small Engine Oil will share all of the characteristics of the 10W-30 (see above). It will be suitable for any gasoline or diesel-powered utility engine requiring a 10W-40 motor oil. This product will be shear-stable, wet-clutch compatible and capable of staying in service longer than mere mortal engine oil. Ideal for applications where service is infrequent.

About AMSOIL 20W-50 Zero-Turn Synthetic Hydrostatic Transmission Fluid

Several common zero-turn lawn mower brands such as Hustler, Gravely, Cub Cadet, Wright and Scag require a 20W-50 oil in their hydrostatic transmission system. This specialized hydraulic oil will be a step up from 20W-50 motor oil and a giant step up from conventional fluid. Expect cooler pump temperatures, longer component life and consistent transmission performance.

March 3, 2017/by Marc Roden

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Marc Roden
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  • How To Find Type A Automatic Transmission Fluid
  • Can AMSOIL Engine/Transmission Flush Be Used In CVT Transmissions?
  • AMSOIL Revises Two-Stroke Oil Recommendation For Sea-Doo Models

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