Flush vs drain and fill

[Colorado-SHOBro]

Has anyone ever had any experience or hear about what is better for the 6f55?
What is officially recommended?
I'll be replacing my mercon lv with amsoil signature series trans fluid and i've got enough to flush the whole system and get all 11+ quarts repalced. Of course there's tons of horror stories about flushing services ruining high mileage transmissions as it breaks away pieces of debris and deposits them in more harmful areas of the transmission. I'm currently at 48k miles so this isn't a huge concern for me. Also i'm going to be doing this at home not taking this to a shop so i'm not referring to a pressure flush where they also use detergents and cleaning agents.
I'm just gonna let the trans pump do it's job and move all the fluid out.
Anyhow just curious is anyone has done a DIY flush like this or what the recommendation is?

Thanks for any input guys!

[Colorado-SHOBro]

Hmmm i just ran across this comment in one of Ford Tech Makuloco's videos. . . has me wondering if i shouldn't have just stuck with the mercon actually

"Brian,  I have been using amsoil oil for years. Signature series atf says it's a replacement for Mercon LV.
Do u think it's OK to go with the amsoil?

Thanks for your videos, they are very helpful! 


FordTechMakuloco:

"You can do whatever I would not use it in my vehicle. Mercon LV has a very specific additive package unlike fluids of the past"

[FoMoCoSHO]

Hmmm i just ran across this comment in one of Ford Tech Makuloco's videos. . . has me wondering if i shouldn't have just stuck with the mercon actually

"Brian,  I have been using amsoil oil for years. Signature series atf says it's a replacement for Mercon LV.
Do u think it's OK to go with the amsoil?

Thanks for your videos, they are very helpful! 


FordTechMakuloco:

"You can do whatever I would not use it in my vehicle. Mercon LV has a very specific additive package unlike fluids of the past"

He's a ford tech, not a tribologist.

[AJP turbo]

The blue label amsoil is LV and meets the Mercon LV specs

So signature series LV ATF is what you want....the non LV is the red label 

[SHOdded]

As far as replacing the fluid in one shot, I hope you have at least 15 quarts handy.  Never run low on fluid!!!

I have posted this link before, I think, this is on a 6F50, but should work for a 6F55 also
http://www.fordedgeforum.com/topic/2040-transmission-fluid-replace/page-2#entry144768

[Colorado-SHOBro]

As far as replacing the fluid in one shot, I hope you have at least 15 quarts handy.  Never run low on fluid!!!

I have posted this link before, I think, this is on a 6F50, but should work for a 6F55 also
http://www.fordedgeforum.com/topic/2040-transmission-fluid-replace/page-2#entry144768

Thanks for the link. I remember reading that a while back. I'm doing something very similar to that process.
I'm going in with about 14.5qts which should be more than enough.

[SHOdded]

Best of luck!

[StealBlueSho]

I had my transmission flushed on my 2010 at my trusted shop... unfortunately they used a "high quality" non-brand name synthetic (lv) fluid. There is a post about it somewhere...

In any event, the transmission did not shift clean when tuned at WOT until I did 3 x drain and fills with Motorcraft Mercon LV...then everything was happy... It was even cleaner with an extra half quart of fluid per LMS recommendations.

Just my experience...




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[StealBlueSho]

This is what I used...


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[Colorado-SHOBro]

I had my transmission flushed on my 2010 at my trusted shop... unfortunately they used a "high quality" non-brand name synthetic (lv) fluid. There is a post about it somewhere...

In any event, the transmission did not shift clean when tuned at WOT until I did 3 x drain and fills with Motorcraft Mercon LV...then everything was happy... It was even cleaner with an extra half quart of fluid per LMS recommendations.

Just my experience...




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This is why no one puts a wrench on my car but me. Even reputable "trusted" shops make mistakes or get careless. Only other people to do any work on my car has been a very close friend of mine did an alignment and the dealer has had the car twice for warranty work.

At any rate the amsoil trans fluid gets here today and i plan to use it tomorrow. I trust amsoil but also think there's some validity to ford tech makuloco's statement about OEM manufacturers having very specific additive packs to their trans fluids these days. I'm sure amsoils fluid match and exceed those requirements but it's still somewhat of a universal fluid vs the lv being specific to ford.

If there's any funny business after the flush i can still flush back to mercon lv if need be.

Can anyone who is running amsoil trans fluid in their 6f55 speak on behalf of their experience?

[AJP turbo]

SHO BRO did you get LV amsoil? If you did not then I wouldn't use the amsoil..LV is not specific to Ford, many OEMs are switching to LV fluid in the name of fuel economy

[griggs95]

I had my transmission flushed on my 2010 at my trusted shop... unfortunately they used a "high quality" non-brand name synthetic (lv) fluid. There is a post about it somewhere...

In any event, the transmission did not shift clean when tuned at WOT until I did 3 x drain and fills with Motorcraft Mercon LV...then everything was happy... It was even cleaner with an extra half quart of fluid per LMS recommendations.

Just my experience...




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This is why no one puts a wrench on my car but me. Even reputable "trusted" shops make mistakes or get careless. Only other people to do any work on my car has been a very close friend of mine did an alignment and the dealer has had the car twice for warranty work.

At any rate the amsoil trans fluid gets here today and i plan to use it tomorrow. I trust amsoil but also think there's some validity to ford tech makuloco's statement about OEM manufacturers having very specific additive packs to their trans fluids these days. I'm sure amsoils fluid match and exceed those requirements but it's still somewhat of a universal fluid vs the lv being specific to ford.

If there's any funny business after the flush i can still flush back to mercon lv if need be.

Can anyone who is running amsoil trans fluid in their 6f55 speak on behalf of their experience?

I switched out my fluid to Amsoil at 25k with the entire flush on the BG machine in mid 2012. When I took the car out I could not believe how smooth the trans shifted and was not at all expecting that. My secondary thought afterwards was 'what the hell took me so long'.

I believe that the "special" additives in the oem fluid is more to get you to use their stuff and also to scare you about warranty claims; basically a training the brain gimmick so you continue to use after warranty as well. The idea being if your car hasn't blown up after 60k, the fluids must work the best so I might as well keep using it.

Amsoil (and other) is in the business of oils and specialize in that. Ford is not. I'm at 83k on that same fluid and haven't topped it off either since its full. I'm getting ready to do it again this spring sine I think its overdue. That's the thing about top quality fluids, you can go longer intervals. To date, no trans problems noticed at all.

[Colorado-SHOBro]

SHO BRO did you get LV amsoil? If you did not then I wouldn't use the amsoil..LV is not specific to Ford, many OEMs are switching to LV fluid in the name of fuel economy

yeah 99% sure i got the right stuff. it's what amsoil listed for my vehicle and i'm assuming the "fuel efficient" is their way of saying low viscosity.


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[StealBlueSho]

I was under the impression LV is just synthetic? At least all the LV I have even looked at was Synthetic...


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[StealBlueSho]

https://www.amsoil.com/shop/by-product/transmission-fluid/automatic/signature-series-fuel-efficient-synthetic-automatic-transmission-fluid/


States it's a replacement for Mercon LV... you are good.


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