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Dexron/Mercon or Dexron 6?

 
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PostPosted: Tue Sep 11, 2012 12:05 am    Post subject:  Dexron/Mercon or Dexron 6? Reply with quote

Today I went to the parts store to get an ATF filter & 6 qts of Dexron. The counter guy gave me the filter, & went to get the ATF, but apologized that they only had 2 qts left in the store. They were Dexron 6. But I told him since my car is a 05, Dexron3/Mercon was fine. He said his computer said to use the Dexron 6, but I said that started with 06. I said read the ATF jug, & ignore the computer. I then showed him 3 different brands of Dex/Merc which all said good up to 05. So is Dex 6 preferable in a 05 to Dex/Merc? Or is the Dex/Merc just fine? GARY

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Frank
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PostPosted: Tue Sep 11, 2012 3:26 am    Post subject:   Reply with quote

It would probably be "just fine", but the Dexron VI is better fluid. I run it in my 2001 with an 2005 drivetrain, and my wife's 2003 Saturn as well.

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PostPosted: Tue Sep 11, 2012 9:36 am    Post subject:   Reply with quote

Dexron 6 is the upgraded version of 3.

It can mix, you can put 6 in a 3 car. But never put 3 in a 6 car.

Dexron 6 actually runs cooler than 3, you should use it Smile

I swapped my Monte over to Dex6 when I did a transmission swap.

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PostPosted: Tue Sep 11, 2012 12:20 pm    Post subject:   Reply with quote

GM is confident enough in Dexron VI that they don't even offer Dexron III for sale to us dealers anymore. Laughing

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PostPosted: Tue Sep 11, 2012 12:47 pm    Post subject:   Reply with quote

Yeah, the newer stuff is usually backwards compatible, & I'd have bought the 6, but the store was out of it, so I was just making sure the 3 was OK. GARY

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PostPosted: Tue Sep 11, 2012 6:06 pm    Post subject:  dexron Reply with quote

You will find that Dex VI is a full synthetic as opposed to Dex III which is not. Many here will tell you to use the Dex VI. I used Dex III last time I changed fluid and all is good. I am a little agaist putting a full sythietic in as I think it might cause leak or other issues in which it was not intended to be used. That is why I still use conventional engine oil, not synthetic. It's your choice. Both will work. Good luck choosing. Just never do a flush. Cool

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