![]() This specialized friction modifier is better for metallic and composite synchros in terms of shifting and life. Therefore, both lubes contain the same EP additives, just in different strengths or additive ratios.Įver since the synchromesh-type fluids appeared on the scene (such as the GM Synchromesh fluid), drivers have had better shifting due to better synchro engagement, attributed to the specialized friction modifier used in these lubes. The exception of course is ATF fluid used in some of the newer transmissions. GL4 has come to infer a gear lube with the above percentages of EP additive. Most manual transmission "specific" fluids (GL4) contain about 40% to 60% of the EP additive of differential lubes (GL5) with inactive or buffered sulphurs. Manual Transmission fluids use a different friction modifier for synchro engagement, a modifier that does NOT contain the same Friction Modifier chemicals as differential lubes. GL5 differential lubes use friction modifiers to reduce mechanical and fluid friction and add some anti-shudder friction modifier for limited slip, both very different chemical compounds. Emulsifiers, corrosion and rust inhibitors also are included to do their respective jobs. ![]() GL4-rated oils contain about 40% to 60% of the EP additives that GL5 oils contain.īoth differential and manual transmission fluids use chemical compounds that subdue or inhibit the corrosive effects of sulfur and phosphorous such as calcium, magnesium, boron, potassium or other basic compounds. ![]() GL4 does NOT refer to any specific viscosity, but it refers to a level of AW/EP protection for the gearing and bearings in a transmission. Most GL5 differential and GL4 Manual Transmission oils contain sulfur-phosphorous EP packages. ![]()
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