Royal Purple Max Gear Synthetic Gear Oil 75W90 1 Quart Bottle Review
I purchased this product to change the differential fluid in my 1970 International Scout. It contains the additive required for the limited slip differential, so that is a bonus.
Sure, there are cheaper oils you can buy for a differential. But from what I have been reading, this stuff is very good and will last much longer than regular "dinosaur" (non-synthetic oil) and will flow at lower temperatures.
I have only done one of the two diff's so far, the rear one, but there already seems to be a slight bit more "grunt" to my tired Scout (an engine rebuild is in the works). I also live in Minnesota, and found my manual transmission, transfer case, and both differentials very "gooey" when the temperature dips down to below freezing. I suspect that this will help somewhat.
On another note, I drained and replaced the fluid in my trans/transfer case with a Castrol "full-synthetic" 5w-50 motor oil, and wow what a difference there! Easier shifts, and much quieter than before. Many think you need to put in a heavy weight oil in these on a truck, but actually many use 50 weight motor oil or standard ATF in their manual transmissions now.
Royal Purple Max Gear Synthetic Gear Oil 75W90 1 Quart Bottle Feature
- Greater wear protection
- Low temperature fluidity, shock load protection
- Lower coefficient of friction, high temperature performance
- Compatible with other oils, meets warranty requirements
- Prevents corrosion
Royal Purple Max Gear Synthetic Gear Oil 75W90 1 Quart Bottle Overview
Max Gear Synthetic Oil 75w90 is recommended for use in truck, motor home / RV, and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify use of an API GL5 or GL4 fluid. MaxGear is an ultratough, high performance, GL5 automotive gear oil designed to provide maximum protection to heavily loaded gears while maximizing power output throughout the drive train. It outperforms other GL5 gear oils because it combines the highest quality synthetic oils with Royal Purple's proprietary Synslide additive technology. MaxGear makes gears run smoother, quieter, cooler and longer without overhauls. All viscosities of MaxGear are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary. MaxGear Synthetic Gear Oil is formulated to improve the efficiency of rear end assemblies and manual transmissions. Virtually eliminates both gear and bearing wear. API GL4 / GL5 Certified.
