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What is the best type of oil for 1966 original Ford 200 cubic inch straight six engine auto tranny?

It's impossible to give a definitive answer to what's the "best" oil for your 1966 Ford 200 cubic inch straight six engine's automatic transmission without more information. The best oil depends on factors like:

* The specific transmission: Different transmissions have different requirements. You'll need to know the exact model of your transmission (e.g., C4, Cruise-O-Matic, etc.).

* Your driving conditions: Do you drive in extreme heat or cold? Do you tow heavy loads?

* The age and condition of the transmission: If the transmission is old or has high mileage, you may need a more robust oil.

Here's a general approach:

1. Consult your owner's manual: The manual will provide the recommended oil type and viscosity for your specific transmission.

2. Look for a transmission fluid that meets the specifications: Check the fluid bottle for labels like "Dexron III," "Mercon," or "Type F." This will ensure compatibility with your transmission.

3. Consider synthetic oil: Synthetic transmission fluids offer better performance and longevity in extreme conditions. However, they may not be compatible with all transmissions.

4. Consult with a mechanic: A trusted mechanic can provide expert advice based on your car's condition and driving habits.

Important Note: Never mix different types of transmission fluids. This can damage your transmission.

Here are some resources to help you find the right oil:

* Your Ford dealer: They can provide you with the exact specifications for your vehicle.

* Online resources: Websites like Valvoline or Castrol have tools to help you find the right oil based on your car's year and model.

* Auto parts stores: Staff at stores like AutoZone or Advance Auto Parts can help you find the correct fluid.

Remember, choosing the right transmission fluid is essential for your car's performance and longevity.