Tuesday, June 11th, 2019 AT 8:16 AM
JESSIE WORTHINGTON
- MEMBER
- 2009 RAM 2500
- 5.7L
- V8
- 4WD
- AUTOMATIC
- 123,000 MILES
Is dex/merc compatible with atf +4?
Transmission fluid compatibility
1 Reply
KASEKENNY
- MECHANIC
- 18,907 POSTS
Hi Jessie,
The oil manufacturer says they are compatible but Chrysler says nothing but ATF +4. I have found that when you mix them or replace with dex/merc it shifts firmer. I don't really like that so I would stick with what the OEM recommends. I understand it is a little more expensive but they designed it to use that fluid not any other.
If it were me, I would stick with what they recommend.
Let me know if you have any other questions. Thanks
The oil manufacturer says they are compatible but Chrysler says nothing but ATF +4. I have found that when you mix them or replace with dex/merc it shifts firmer. I don't really like that so I would stick with what the OEM recommends. I understand it is a little more expensive but they designed it to use that fluid not any other.
If it were me, I would stick with what they recommend.
Let me know if you have any other questions. Thanks
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Wednesday, April 21st, 2021 AT 3:31 PM
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