Royal Purple Max Gear Oil 85W140 has the ability to prolong the life of your internal parts through its non-corrosive properties is money in the bank for you and just another way to fall in love with your Jeep, truck or other trail or other off road vehicle. The rough terrain and heavy load of off-road use deserve and required a high-quality, superior product that is designed with perfection in mind. Extending gear and bearing life is one way to create a quieter and smoother run while also reducing the friction and heat buildup. Royal Purple Max Gear Oil 85W140 1QT. is the one known Gear oil that has been able to accomplish all these demands with the use of their exclusive Synerlec additive technology and still come out ready to perform everything a driver needs any given day.