1 Best transmission fluids for older transmissions

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These fluids might be too viscous for newer transmission systems. Transmission fluids that may be too thick for some modern transmissions are typically designed for older or specific high-stress applications. While beneficial in certain scenarios, their higher viscosity can cause issues in newer systems designed for lighter fluids. Modern transmissions often require lower viscosity fluids for optimal efficiency and performance. Using thicker fluids in these systems could lead to increased power loss, reduced fuel efficiency, inadequate lubrication of small passages, or difficulty in cold starts. This mismatch could potentially result in premature wear or damage to transmission components.
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