"<20> <80>" - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 06-22-2019, 03:28 PM Thread Starter
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"<20> <80>"

The temperature markings on the transmission dipstick. Is that the temp shown on the gauge in the instrument cluster, or the actual tranny temp? While the engine temp is showing 80, the fluid level on the tranny dipstick is just above the high mark for 20, but nowhere near the low mark for 80.

I have the "sealed for life" tranny, (I forget the model number, 722. something)

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post #2 of 9 (permalink) Old 06-22-2019, 03:46 PM
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It is actual fluid temperature. Measured with infrared temp gauge or retrieved using MB scan tool.

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post #3 of 9 (permalink) Old 06-22-2019, 03:50 PM Thread Starter
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OK thanx. I guess it may well be in parameter then. What a PITA. What keeps it from cooling between dipping and measuring temp? Other than hooking up the scan tool every time I want to check fluid level, I guess it's just "poke and hope" or do it cold?

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post #4 of 9 (permalink) Old 06-22-2019, 05:12 PM
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Originally Posted by bluerooster View Post
OK thanx. I guess it may well be in parameter then. What a PITA. What keeps it from cooling between dipping and measuring temp? Other than hooking up the scan tool every time I want to check fluid level, I guess it's just "poke and hope" or do it cold?
No, it is not poke and hope. Measure pan temperature with gauge.

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post #5 of 9 (permalink) Old 06-22-2019, 09:50 PM
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First confirm what transmission you have.
If you have factory dipstick that means you have 4sp transmission who required often fluid changes.
The newer 5G transmission never had dipstick on the car and you have to use shop dipstick to check the level.
When 20C marks are for initial fill after servicing, the 80C marks are for proper confirmation of the level.


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post #6 of 9 (permalink) Old 06-22-2019, 11:03 PM
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Originally Posted by bluerooster View Post
OK thanx. I guess it may well be in parameter then. What a PITA. What keeps it from cooling between dipping and measuring temp? Other than hooking up the scan tool every time I want to check fluid level, I guess it's just "poke and hope" or do it cold?
The 20 degree section is for initial check only , ,,,the correct check is done at 80 degrees,,,engine running , car in Park after shifting through all gears for 5 seconds.

Drive your car for at least 12 miles in suburban setting ,,and the temp will be at 80 ,,,come back ,park level and do the fluid level check as per the method above...aim for the upper half of the 80 degree section ,,add no more than 100 ml at a time to avoid overfilling.
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post #7 of 9 (permalink) Old 06-24-2019, 04:50 PM Thread Starter
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Originally Posted by Kajtek1 View Post
First confirm what transmission you have.
If you have factory dipstick that means you have 4sp transmission who required often fluid changes.
The newer 5G transmission never had dipstick on the car and you have to use shop dipstick to check the level.
When 20C marks are for initial fill after servicing, the 80C marks are for proper confirmation of the level.
No factory dipstick, just a cap, with a locking device. Have the dipstick "tool" from Autohaus.

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post #8 of 9 (permalink) Old 06-24-2019, 04:51 PM Thread Starter
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The 20 degree section is for initial check only , ,,,the correct check is done at 80 degrees,,,engine running , car in Park after shifting through all gears for 5 seconds.

Drive your car for at least 12 miles in suburban setting ,,and the temp will be at 80 ,,,come back ,park level and do the fluid level check as per the method above...aim for the upper half of the 80 degree section ,,add no more than 100 ml at a time to avoid overfilling.
Thanx, that's what I needed to know.
Benzyle likes this.

Thanx,
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post #9 of 9 (permalink) Old 06-24-2019, 09:31 PM
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So you have 722.6 5 speed transmission ,,,
btw ,,sealed for life ,,,doesn't work very well ,,they need regular fluid and filter changes if you want it to perform for a long time. Also replace the electrical connector bushing.
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