API GL-5 is a rating set by the American Petroleum Institute that defines the performance level of gear oils. GL-5 gear oil is designed for high-pressure applications, such as in differentials and manual transmissions, where gears are under heavy loads. It contains additives that help protect metal surfaces from wear and corrosion. If you're looking for gear oil for your vehicle's differential or other demanding gear systems, GL-5 is a common choice. Always check your owner's manual to confirm the right specification for your vehicle.

GL-5 gear oil is formulated for higher-pressure conditions compared to GL-4. While GL-5 offers stronger protection for gears, it may not be suitable for all applications, especially some manual transmissions that require GL-4. The additives in GL-5 can affect certain materials, like yellow metals, found in some gearboxes.

• Always follow your vehicle manufacturer's recommendations.
• Using the wrong type can impact performance or cause premature wear.

75W-90 synthetic gear oil is popular because it offers reliable performance across a wide temperature range.

• 75W means it flows well in cold conditions, helping with smooth startups.
• 90 indicates it maintains thickness at higher temperatures, protecting gears under stress.
• Synthetic formulas often provide better resistance to breakdown and longer service intervals.

To find out if your car needs GL-5 gear oil, check your owner's manual or look for a sticker near the gear oil fill plug. Manufacturers specify the required API rating for optimal protection and performance.

• GL-5 is commonly used in differentials and some manual transmissions.
• Using the correct oil helps prevent gear wear and ensures smooth operation.

75W-90 gear oil is designed to perform well in both cold and hot conditions.

• The '75W' rating means it stays fluid in low temperatures, making cold starts easier.
• The '90' rating ensures it remains thick enough to protect gears when things heat up.