Here's how to determine the correct gear oil for your 1990 Ford Ranger:
1. Check your owner's manual: The most reliable source for this information is your vehicle's owner's manual. It will specify the exact type of gear oil and the required viscosity.
2. Look at the transmission: If you don't have the owner's manual, you can often find a sticker on the transmission itself. This sticker may indicate the recommended gear oil.
3. Consult a mechanic: If you're unsure, it's best to consult a qualified mechanic. They can identify the correct type of gear oil for your vehicle.
Common Gear Oil Types for Manual Transmissions:
* SAE 75W-90: This is a common type of gear oil for many older vehicles.
* SAE 80W-90: Another common option.
* GL-4 or GL-5: These are classifications for gear oil quality, with GL-5 being more resistant to wear.
Important Considerations:
* Synthetic vs. conventional: Synthetic gear oil offers better performance and longevity.
* Temperature: If you live in a region with extreme temperatures, you may need a gear oil that is specifically formulated for those conditions.
Remember: Using the wrong type of gear oil can damage your transmission. Always consult your owner's manual or a qualified mechanic to ensure you're using the correct fluid.
