Im very willing to see what ever you want to show me and will look at it with an open mind. To think I am just shooting from the hip and do not have facts to back me up is somewhat insulting, Show me the facts and I will reply to them with facts! I know better than to just take someones word for something that I beleive to be BS!<br /><br />Copy and paste<br /><br />Proper differential and transmission lubrication requires a product which will satisfy a wide range of service conditions. The off-set gear intersection design in hypoid differentials requires a high degree of extreme pressure chemistry to prevent scoring of the ring and pinion set under high-speed conditions and spalling under low-speed / high-torque conditions. High temperatures can cause a breakdown of the petroleum, forming insoluble sludge which can plug the bearing cages and cause oil starvation to the bearing surfaces. Limited-slip clutches require additional slipperiness compared to conventional hypoid differentials in order to prevent the noise and vibration producing stick/slip phenomenon. Most of these friction modifier supplements detract from the load-carrying capability of the lubricant. Synthetic 75W90 and 80W140 Gear Oils have been developed to be used in both conventional and limited-slip differentials, providing additional slipperiness for the limited-slip units and also enhance the load-carrying capacity of the gear oils. The synthetic components used provide a naturally high viscosity index, which means that Synthetic Gear Oils have a relatively constant viscosity with changing temperature. They will not thin out as readily at high temperatures when compared to petroleums and they are much more fluid at low temperatures. Figure 1 compares the high temperature oil film thickness of Synthetic Gear Oils compared to petroleum products. Synthetic 75W90 provides a much greater viscosity than a petroleum 80W90 (SAE 90). The contact zone temperature can be several hundred degrees greater than the bulk oil temperature. This difference in high-temperature viscosity and the ability to more effectively lubricate in extreme temperatures may prevent oil film rupture at high temperatures and loads. <br /><br /> IMPROVED LOW TEMPERATURE FLUIDITY<br />Cold weather can be just as damaging to differentials and transmissions as sustained high-temperature use. Rapid oil flow to the bearings and adequate lubricant splashed to the gear teeth is critical to prevent component fatigue and premature failure. At -15°F an SAE 90 gear oil will take more than 5 minutes to flow to the bearings while Synthetic 75W90 requires only a second. This dry lubrication can cause rapid fatigue damage. High viscosities when cold will also rob the vehicle of considerable power until the lubricant has fully warmed up.
Sorry if Im too sure of myself! I'm new to this forum and learning alot of new tricks. I'm not trying to make waves(no pun intended!)
