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Old 09-27-2013, 11:39 AM   #1790
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 9,550
My Ride: '06 330CiC, '03 M5
Quote:
Originally Posted by adaseb View Post
I think they have a narrow window because the oil expands with higher temperatures
The narrow temperature window is a safety issue, nothing specific to the expansion, which it will, but not sure you would want to check transmission fluid that is 210F while it is pouring down your hand and arm.

So for all the automatic transmissions that have no dipstick, the temperature to check the level is usually between 100-120F, again, juts below the scald point to hopefully eliminate people from getting burned while checking the transmission fluid.

An with most fluid checking, you cannot control the "cold" temperature. It could be below freezing in some areas and for someone that lives in South Florida or South Texas cold could be 80F.

So to have the fluid check at 100-120F, then regardless of where you live and the current temperature the check can be performed at a consistent temperature and one that is safe to hopefully not cause burns.
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Last edited by jfoj; 09-27-2013 at 11:45 AM.
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