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My auto transmission gearbox shows the correct level on the dipstick when it is cold, but no level when the engine is hot and running

When the gear oil is hot with the engine running, no oil is shown on the dipstick at all. It should show the oil level at the higher level mark on the dipstick

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Depending on the car you have, this might be normal, as usually some models require to check the oil when it's hot, but engine off, others require the engine to be running. Each manufacturer has specific conditions and though they are similar, they usually are not quite the same. So read the owners manual carefully, or call up the dealer and ask them to be sure. If your model is meant to be checked while running and shows no oil on the dipstick, then probably the tranny's oil filter is clogged and not allowing a good oil return flow. Could also be a clogged oil cooler. Either way you will need to drain the oil from the tranny to be able to examine the oil filter located inside the pan, or the oil cooler located up front near the radiator usually. Best way to test the cooler for cloggin is by shooting some compressed air into it and check if it comes out ok on the other end, or if it seems to have less pressure coming out, or even giving you a hard time to hold the hose in there while shooting air. Although be careful if doing that, cause there will still be some oil in the cooler and shooting air in there will spatter oil all over the place, so get a rag or bucket handy to collect the oil and not get it all over the walls :P

Posted on Mar 25, 2014

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Check the oil level as follows:

Park the car on a level surface with the engine idling . Slowly move the gear selector lever through all the shift positions and then to position P. Wait 3 minutes before checking the oil level.
As the illustration shows, the dipstick has a COLD and a HOT side. The oil level should between the MIN and MAX marks. Wipe the dipstick with a clean cloth.

WARNING! The oil may be very hot.



Do not use rags that could leave lint on the dipstick. The transmission is topped up via the dipstick tube. The space between the MIN and MAX marks on the dipstick corresponds to 0.5 US qt. (0.5 liter). Do not fill the transmission with too much oil, since this can result in oil being ejected from the transmission. Too little oil, on the other hand, can negatively affect transmission operation, particularly in very cold weather.

A Cold transmission: oil temperature 105° F (40° C). This is a normal temperature for the transmission after idling for about 10 minutes. At oil temperatures below 105° F (40° C), the level may be below the MIN mark.
B Warm transmission: oil temperature 169° F (80° C). This temperature after driving for about 30 minutes. At oil temperatures above 190° F (90° C), the level may be above the MAX mark.

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