'18 Ford FLex 30K drain and fill

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252
Location
Kern Co. California
Thread starter
So my wife's 2018 FLex is approaching 30k miles and per the owners manual and all the advice I have been given a transmission drain and fill is in order along with some other items. It seems simple, drain plug on bottom, fill with about 5+ quarts when done to dip stick full level... Other than the appropriate fluid type, what brand should I go for? Anyone know if its synthetic from the factory? Thanks.
 

cos

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1,332
Location
Metro Detroit
No need to bother with "when done to dip stick full level". Just check the fluid level sometime before you drain it to make sure you have the correct amount of ATF in the trans. Then measure exactly what comes out and pour that amount back in.
 
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4,097
Location
SW Ohio
Nothing wrong with Mercon LV especially if you're changing it every 30k miles. Castrol Full Synthetic ATF and MAG1 LV ATF are both <span style="font-weight: bold">licensed</span> - not "recommended" and not "acceptable for" - but fully licensed by Ford for LV applications.
 
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4,097
Location
SW Ohio
Originally Posted by cos
No need to bother with "when done to dip stick full level". Just check the fluid level sometime before you drain it to make sure you have the correct amount of ATF in the trans. Then measure exactly what comes out and pour that amount back in.
If there's a dipstick, use it. Measuring the amount is certainly a good starting point and yes, it's what I would put back in first. Then I'd get it warm and ready to check the level using the dipstick for a final check.
 
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10,218
Location
USA
Get a measuring bucket, if you don't already have one smile Drain the fluid when cold, measure how much you drained, then refill with the same amount you drained.
Originally Posted by hallstevenson
Nothing wrong with Mercon LV especially if you're changing it every 30k miles. Castrol Full Synthetic ATF and MAG1 LV ATF are both licensed - not "recommended" and not "acceptable for" - but fully licensed by Ford for LV applications.
approved Both of those are good stuff
 
Messages
1,172
Location
California
I would stick with OEM fluid. I mean really, how much are you spending, how often? Not worth saving a few dollars per year on aftermarket stuff that's generic formula for dozens of models. My $0.02
 
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