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#2495603 - 01/16/12 03:51 PM Stay with Dexron 3 or go with Dexron 6
94astro Offline


Registered: 01/09/12
Posts: 145
Loc: Oklahoma
On my 1994 Astro I am going to do a pan drop & filter change, should I stay with Dexron 3 or go with Dexron 6? Is it ok to mix the two? I have heard of horror stories about a flush on these transmissions, true or not I would rather just drain the trans. a few times and refill until all is clean. At Walmart the price for 6 is just a little higher than Dex 3. Is SuperTech OK to use? sorry a lot of questions bit I would like your input as I want to keep this van for a long time.

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#2495607 - 01/16/12 03:55 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
SLCraig Offline


Registered: 12/21/08
Posts: 5527
Loc: London, ON, Canada
You can mix, but with a vehicle that old, I would recommend trying to not get a back spec'd fluid and get one that is only D-III compliant. They are out there. I recently bought some for 2 vehicles which spec D-III (not D-VI)

I would assume any brand is fine as long as it meets spec.
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#2495609 - 01/16/12 03:56 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
229 Offline


Registered: 06/23/11
Posts: 722
Loc: Mid Atlantic
Dexron6
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#2495610 - 01/16/12 03:58 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
Warstud Offline


Registered: 09/02/05
Posts: 4009
Loc: MIchigan
DexIII & Lubegard...

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#2495622 - 01/16/12 04:10 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
daman Offline


Registered: 09/23/06
Posts: 10906
Loc: Bad Axe, MI
Do a line flush and change out to dex 6.
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#2495632 - 01/16/12 04:21 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
wirelessF Offline


Registered: 10/04/07
Posts: 1606
Loc: Oahu, Hawaii
Supertech DexVI is an excellent fluid to use, plus its a lisenced GM fluid so it meets GM's standards.

Note, check on the bottle for the lisence number. Pretty awesome.

I'm doing DexVI drain/refills every 5,000mi. Good if you are DIY'ing it.

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#2495642 - 01/16/12 04:28 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 17566
Loc: Sunny Florida
Just a note that some older cars experience unusual symptoms with dexVI.

But we use it in many, many GM trucks with no problems at all.
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#2495647 - 01/16/12 04:34 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
94astro Offline


Registered: 01/09/12
Posts: 145
Loc: Oklahoma
Yes I DIY, won't trust any shop. One other question, what about Lucus Transmission fix, any good or just hype?

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#2495650 - 01/16/12 04:39 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
stro_cruiser Offline


Registered: 02/26/11
Posts: 677
Loc: South Florida
I recently did the same job on my '89 astro. I used Valvoline fully synth DexVI and lubeguard red. It has done a fantastic job, went from having tranny issues to something that works just fine!

I did fit an aux cooler at the same time with an in-line magnefine filter.
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#2495685 - 01/16/12 05:11 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
Bluestream Offline


Registered: 09/13/03
Posts: 5223
Loc: Waterloo, ON
I would go with Mercon V just to be safe...Who wants to have to drain out good ATF if its doesn't work well.
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#2495705 - 01/16/12 05:25 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: daman]
mechanicx Offline


Registered: 10/23/09
Posts: 8576
Loc: Ohio
Originally Posted By: daman
Do a line flush and change out to dex 6.


+1

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#2495733 - 01/16/12 06:00 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: wirelessF]
JRed Offline


Registered: 06/01/09
Posts: 1688
Loc: Virginia
Maxlife Dex/Merc
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#2495791 - 01/16/12 06:52 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: JRed]
CLeming Offline


Registered: 12/10/11
Posts: 40
Loc: UT
If it were mine I would do a pan drop and filter change with good filter like Wix, put in Maxlife Dexron and Lubeguard, and repeat the fluid change without filter change in 10k miles. Some older vehicles dont like a complete fluid change.


Edited by CLeming (01/16/12 06:53 PM)

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#2495876 - 01/16/12 07:39 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: 94astro]
sciphi Offline


Registered: 03/24/07
Posts: 9697
Loc: Upstate NY
Maxlife Dex/Merc and Lubegard Red. It worked very well in my old Buick's transmission.
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#2496138 - 01/16/12 11:17 PM Re: Stay with Dexron 3 or go with Dexron 6 [Re: sciphi]
mva Offline


Registered: 02/09/08
Posts: 763
Loc: Northern BC, Canada
In an older vehicle I would stick with dexIII or go with a high mileage fluid such as Castrol - if you can find it.

http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9018758&contentId=7033928
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