Correct transmission fluid level

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Old 23 May 2006, 11:44 am   #1 (permalink)
Daniel
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Default Correct transmission fluid level

Correct transmission fluid level - not as easy as it sounds.

The manual calls for checking hot, but not after driving for long
periods at high speed, or idling with air conditioning on in hot
weather. In these cases wait 30 minutes. Fluid temperature should be
between 158 - 176*F, and level between hot marks on dipstick. That is,
not above the "dip" center of the upper mark.
Then the manual has a note in bold capital letters: "Do Not Overfill."
I thought I'd been doing this right but I actually had filled slightly
over the top of the top mark. (the part where the "dip" ends)
Drove the car for 9 miles one evening and the fluid level was between
the "hot" marks.
Then checked it after a longer freeway drive and was above the top
mark.
So let it cool awhile, placed an oven thermometer on the case and it
read 165*F, so I siphoned off a bit of fluid to get it just at or
slightly below the "dip" center of the upper mark.
Surprise.
The car seems to run better now. There was always an unidentifiable
whine in the transmission which I'd thought was normal - now gone, plus
it seems to idle more smoothly. Perhaps just my imagination, or perhaps
they actually have a good reason for saying "do not overfill."
If it took me this much effort (I usually add back in the same amount
drained by measuring in the graduated empty quart oil containers),
imagine how likely it is that the quick lube place gets it right first
try.

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Old 26 May 2006, 09:11 am   #2 (permalink)
Rob
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Default Re: Correct transmission fluid level

Your imagining things. No way would this affect the idle. Would not
affect a whine either. Overfill really means over fill by a lot!
My camry has a whine at 68mph since new 220,000 miles ago.
Really not a problem.

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