Aisin ATF-0WS Naphtha Content?

[CEHepp]

I was servicing my transmission today and noticed that the Aisin OEM fluid contains naphtha. Why would ATF contain such a chemical?

 

[dippschtick]

Google AI says:

In transmission fluid, naphtha is not a primary ingredient or a component added for its lubricating properties.
Instead, naphtha is a general term referring to a class of hydrocarbon mixtures derived from petroleum or coal tar. It has various uses as a solvent, fuel component, and industrial feedstock.
Therefore, if naphtha is present in transmission fluid, it's most likely due to it being a contaminant or a component of a base oil or additive package that was not fully refined or separated. For example, some base oils for lubricants might be derived from petroleum fractions that originally contained naphtha, and trace amounts may remain even after refining.
It's crucial to consult the Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) for a specific transmission fluid to understand its exact composition and potential presence of naphtha or other hazardous components. These documents provide detailed information on ingredients, potential hazards, and safe handling practices.


I have this exact ATF in my 2018 4Runner.

 

[dippschtick]

Grok is somewhat different:

Automatic transmission fluid (ATF) may contain naphtha or naphtha-derived components for several reasons related to its chemical composition and functional requirements. Here's a concise explanation:

1. Base Oil Component: Naphtha is a petroleum distillate often used as a starting material to produce refined base oils for lubricants like ATF. These base oils provide the necessary viscosity and lubricity to ensure smooth operation of the transmission's moving parts.
2. Solvent Properties: Naphtha has excellent solvent properties, which can help dissolve and blend additives into the ATF. Additives such as detergents, dispersants, and anti-wear agents are critical for maintaining fluid performance, preventing sludge, and reducing friction.
3. Viscosity Control: Naphtha-derived components can help achieve the low viscosity required for ATF to flow effectively at various temperatures, ensuring proper hydraulic function and heat transfer in the transmission.
4. Cost-Effectiveness: Naphtha is relatively inexpensive and widely available, making it a practical choice for formulating cost-effective base oils or additives for ATF.
5. Cleaning and Stability: Naphtha's solvent nature can aid in keeping transmission components clean by dissolving contaminants and preventing deposits, contributing to the fluid's overall stability and longevity.

Note: While naphtha itself is not typically a major component in the final ATF product, its derivatives (like highly refined mineral oils or synthetic hydrocarbons) are commonly used. The exact composition depends on the ATF formulation, which varies by manufacturer and specification (e.g., Dexron, Mercon).If you have a specific ATF brand or safety data sheet (SDS) in mind, I can help analyze its composition further!





AI has a way to go.