Can I mix Mobile 1 ATF in with my current stock tranny fluid?

[sickwilly]

I just purchased a 2005 Sport Trac (1st post here). I love it! Its now got 30K so its time to do some maintenance. Among other things, I plan to replace a percentage of the tranny fluid this weekend using my Moeller fluid vac, sucking it right out of the tranny dipstick tube.

My question is this, can I start the process of replacing the stock mercon V with some Mobile 1 ATF, or should I stick with a mercon V fluid?

I will be removing a percentage of the fluid at a time, adding in new fluid, driving the car, and then repeating. Doing it this way, I might eventually get up to a 90% fluid exchange, but wont get 100% of the old fluid out.

I would like to have the best protection possible, as it was the death of my last explorer's second transmission that finally pushed me over the edge with it.

 

[410Fortune]

does the mobil ATF bottle say its compatible with Mercon V?

2003 still has a dipstick tube? Thank god! many models do not... they call the trans filter and fluid "lifetime" = WAJ

 

[sickwilly]

Yes it does, it says:

Also suitable for use in vehicles that specify the following fluid requirements:

* Ford* MERCON*, MERCON V, MERCON LV

Its what is recommended in the sticky above: Transmission Common Sense If You Have A Problem.... Maybe its overkill and a good mercon V is good enough?

Actually my 2005 still has a dipstick, but there is a radiator hose right above it, so its hard to see and you have to pull the hose to the side to get the dipstick in and out.

 

[410Fortune]

the Mobil ATF can be added to your existing fluid, yes

I think Mobil One ATF = overkill, but I drain my trans every year, so cheap-o Mercon V is good enough for me! If it meets Mercon V requirements, it is adequate, anything more can be throwing $$$ away, BUT if you are only going to change trans fluid once every 100K miles then overkill may be a good thing and Mobil 1 is always a good thing, just not always worth the $$$$

 

[Tbars4]

...I see the Mobil 1 Synthetic is compatible...
http://www.mobiloil.com/USA-English/MotorOil/Other_Products/Mobil_1_Synthetic_ATF.aspx

...There is also the Mobil Multi-Vehicle ATF that is "Formally approved for MERCON® V" and is also "is also suitable for use in vehicles that specify the following requirements: Ford* MERCON*, MERCON LV"...
http://www.mobiloil.com/USA-English/MotorOil/Other_Products/Mobil_Multi-Vehicle_ATF.aspx