Red Line 75W-140NS GL-5 Gear Oil Popular for historic and vintage transmissions, like Mid-1930s to early-1950s synchro-equipped gearboxes in cars and trucks Helps with noisy or rough shifting in troubled A-833 Dodge/Plymouth 4-speed transmissions from 1964 to 1969 Option for noisy transmissions when mixed with 75W90NS or MT-90 to bring viscosity level up Also used in clutch-type limited slip differentials in racing for maximum lock up-some users add Limited Slip Friction Modifier in small doses to customize slippage Non corrosive formula, safe for use with all synchro materials PRODUCT DETAILS: These products contain the extreme pressure additives necessary for ultimate protection road cars and racing vehicles, as well as friction modifiers (except NS) for proper limited-slip operation Fully-synthetic formulas created from polyol ester base stocks, offer excellent lubrication under extreme conditions Ester base stocks and friction modifiers (except NS) provide additional slipperiness to lower operating temperatures by reducing the sliding friction in hypoid gears High viscosity-index (VI) to provide relatively constant viscosity and film thickness with varying temperature change Superior shear stability and reduced oxidation compared to other synthetics and conventional gear oils Exceed API GL-5 specifications Engineered to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals, and less wear TYPICAL PROPERTIES API Service Class GL 5 SAE Viscosity Grade (Gear Oil) 75W140 Vis @ 100°C, CSt 26.9 Vis @ 40°C, CSt 162 Viscosity Index 200 Pour Point, °C -45 Pour Point, °F -49 Brookfield Viscosity, Poise 1200 @-40°C