Originally posted by Thrumbleux
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450 outside temperature sensor
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There is a direct link between oil viscosity and mass.
One theory says that a thin oil has less mass and can lubricate easier upper part but not so great sometimes penetrating power.
If it is thinner, drain quickly, especially in the presence of the shear forces, centrifugal and centripetre but you can guess the rest of forces horde of engineers at Daimler R & D have been considered.
Tribology is a very large, so use fluids recommended by the manufacturer.
In this case (the W450) is recommended Mobil ATF D 21065 (only) http://www.mobil.com/UK-English/Lube...F_D_21065.aspx , oil no longer occurs or is found only jug of 20l .
In conclusion we opted for Motul Dexron IID https://www.motul.com/system/product...pdf?1335541304 oil which has substantially the same characteristics .Mobil ATF220 or Comma AQM are too thin.
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Originally posted by tolsen View PostMy conclusion is that Getrag design engineers had done bearing life calculations and found too short life for three high loaded bearings. A simple solution was then to specify double sealed grease lubricated bearings for these to ensure a reasonable overall expected life of the transmission.
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