Here's why:
* GL-4: This is the standard for most older manual transmissions. It offers good wear protection and lubricity for the gears and synchros.
* GL-5: This is designed for heavier-duty applications like differentials and newer, high-performance manual transmissions. It contains more extreme pressure additives, which can actually be harmful to older transmission components.
Important Notes:
* Viscosity: Check your owner's manual or consult a Honda dealer for the recommended viscosity. You'll likely need a 75W-90 or 80W-90 oil.
* Fluid Capacity: Make sure you know how much oil the transmission holds. You'll find this information in the owner's manual or a repair manual.
* Synthetic vs. Conventional: While synthetic gear oil offers better performance and longevity, conventional gear oil is perfectly fine for most older vehicles.
Always consult your owner's manual for the most accurate and up-to-date information regarding fluids and maintenance for your vehicle.
