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Research
Ref No FRX 090905 January 19th, 2006 Page Number 6
Property
Automatic Transmission Fluid Limits
Viscosity, cSt, 40°C
Acid Number (AN)
±15% from baseline
1.5 increase from baseline max
Pentane Insolubles
Patch Test for Sludge Content
(Radial Planer Chromatographic Analysisby Fluid Rx)
0.25% max
Visible particles or moderate discoloration and/or darkening of center of substrate
Particle Count
ISO 23/19/15 max
Manual Transmission and Transfer CaseFluids
Unlike A TF fluids, manual transmission and transfer case fluids are formulated primarily to cool and lubricate the system. The fluids are typically splash fed onto frictional component surfaces by the gears.
Interval-based Recommendations:
OEM and aftermarket article recommendations for manual transmission and transfer case fluids commonly ranged from 15,000 to 60,000 miles. The largest exception to the range is the 2005 GM Silverado, which recommends an interval of 150,000 miles on the Silverado’ s manual transmission.
Condition-based Recommendations:
Limited information was available condition based lubricant change as the practice seems to be rarely applied. The transfer case and the manual transmission lubricants are gear oils. In general, the limits below are observed by laboratory testing facilities:
Property
Manual Transmission and Transfer CaseFluid Limits
Viscosity, cSt, 40°C & 100°C
±15% from baseline
Pentane Insolubles
1.0% max
Acid Number (AN)
1.5 increase from baseline max
Patch Test for Sludge Content
(Radial Planer Chromatographic Analysisby Fluid Rx)
Noteworthy discoloration and/or darkening of center of substrate
Particle Count
ISO 21/18/16 max
Differential Fluids
Similar to transfer case fluids, the front and rear differentials are also splash lubricated. However, differential gear lubricants are usually more viscous and contain roughly twice the additive load compared to manual transmission and transfer case fluids since they are exposed to higher loads/slower speeds.
The comments and recommendations rendered are for general advisory purposes only and intended for the sole use of Fluid Rx. Distribution of copyright protected items is limited. These services are offered by Noria without warranty or liability as to accuracy or completeness of this information.
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