Good Maintenance Practices:
- When the fluid becomes contaminated, drain the fluid, flush the system with DEXRON-VI Automatic Transmission Fluid, and refill with new fluid.
- Make sure to flush the transmission with DEXRON-VI Automatic Transmission Fluid, not a solvent.
- Do not add any aftermarket additives to the fluid - they are not necessary and should not be used.
Troubleshooting Tips:
- Causes of transmission fluid degradation include overall thermal stress, mechanical shearing, and contamination.
- Mechanical shearing affects the fluid's viscosity modifiers, causing the fluid to thin.
- Common sources of contamination include metals and other engine fluids.
- Coolant contamination is particularly harmful and usually requires a complete overhaul or even replacement of the transmission.
- Signs that transmission fluid should be replaced include: transmission grinding or making strange noises, problems shifting gears, gears slipping, vehicle 'surging' (lurching forward or falling back), delays in vehicle movement, and/or miles driven since last fluid change exceed recommended limit.

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