Friday, Jan 17, 2014 at 15:04
The important thing to remember is that oil coming out of a hard-working automatic transmission on a hot day with a heavy towing load, might be around 130 deg C - but some internal components in the transmission can be running at temperatures up to 600 deg C!
The oil operating temperature of your automatic transmission is best kept in the narrow range of 80 deg to 110 deg C.
At 120 deg C oil temperature, the oil in contact with the exceptionally high operating temperature components, is starting to break down with heat.
Oil
breakdown affects the oil additives and reduces the oils ability to lubricate and protect the transmission.
We use temperatures of a maximum of 130 deg C with heated oil baths, to install interference-fit bearings in earthmover transmissions.
Bearing manufacturers warn that temperatures in excess of 130 deg C affect bearing steel characteristics - and that means reduced life.
Any automatic transmission repairer of note, will tell you straight-out, that constant high automatic transmission operating temperatures (over 120 deg C) is a good way to give them plenty of work!
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