Red Line 75W140NS Gear Oil (Set of 12 x 1 Qt) 57104

Red Line synthetic gear oil is formulated for superior protection against wear and tear at elevated temperatures. These synthetic oils outperform petroleum-based lubricants by reducing friction and wear, leading to a 10 to 70 degree Fahrenheit decrease in differential temperatures. They are available in various viscosities to suit both street and racing applications.

One key feature of Red Line synthetic gear oil is the absence of friction modifiers, which are found in some high-performance gear oils (like 75W140 GL-5). This characteristic makes them ideal for transmissions in older vehicles, particularly those with synchromesh gearboxes used in cars and trucks manufactured between the mid-1930s and early-1950s. Additionally, they can improve shifting performance in problematic A-833 Dodge/Plymouth 4-speed transmissions (1964-1969) that exhibit noise or roughness.

In some cases, Red Line synthetic gear oil can be mixed with other Red Line products, such as 75W90NS or MT-90, to raise the viscosity and address noisy gearboxes. They are also compatible with clutch-type limited slip differentials used in racing applications, where their ability to maximize lockup is valued. For those seeking to fine-tune slippage characteristics, a small amount of Limited Slip Friction Modifier can be added.

Red Line synthetic gear oil is formulated to be non-corrosive and safe for use with all synchronizer materials.

Since most GL-5 gear oils for differentials are too slippery for manual transmissions, Red Line offers these products that ensure proper shifting while providing ultimate wear protection