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#4807140 - 07/06/18 08:58 PM DEX VI insanity
Gimpy1 Offline

Registered: 08/24/17
Posts: 116
Loc: Displaced Texan in Mexico City
Hi all.Quick question about DexIII and DexVI, before you flame me for not searching I have and get mixed answers. My car is at 89,000 miles and I will be driving to Dallas this weekend. While I'm in Dallas I plan on changing the ATF. I would have liked to drop the pan and do a filter swap but logistics prevent me from doing so, plus I changed the filter at 60 K. Instead I will be using a mityvac to suck the fluid out from the trans fill tube and I already know that this method will only pull 40% out. I have already ordered 2 gallons of AC Delco DEX VI, and plan on doing the fluid exchange twice. Is this adequate? I'm well aware that Dex VI is backwards compatible with DexIII but have also heard that in some Allison transmissions DexVI can cause leaks. I'm also concerned that the remaining DexIII will cause issues. Am I overthinking this?car is a 2005 GTO mainly city driving with occasional high speed stints. TIA

Edited by Gimpy1 (07/06/18 09:00 PM)
Edit Reason: Typos

#4807144 - 07/06/18 09:02 PM Re: DEX VI insanity [Re: Gimpy1]
bubbatime Offline

Registered: 03/18/08
Posts: 5723
Loc: South Florida
Why not stick with DEX III if thats what the car came with?
17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30

#4807148 - 07/06/18 09:06 PM Re: DEX VI insanity [Re: Gimpy1]
clinebarger Offline

Registered: 12/19/13
Posts: 1990
Loc: Fort Worth, Texas
Your 4L65E is fully compatible with Dexron VI, No seal issues to worry about.
2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

#4807154 - 07/06/18 09:08 PM Re: DEX VI insanity [Re: Gimpy1]
slacktide_bitog Offline

Registered: 03/20/08
Posts: 6378
Loc: USA
You can use Dexron VI with no problems smile

#4807166 - 07/06/18 09:14 PM Re: DEX VI insanity [Re: Gimpy1]
goodtimes Offline

Registered: 12/08/10
Posts: 2909
Loc: california
Backwards compatible means you can mix any way at all with no problems. Just listen to GM. It will take many changes to get 99% D6. Always will be an amount of the D3 inside.

#4807219 - 07/06/18 10:08 PM Re: DEX VI insanity [Re: Gimpy1]
kschachn Offline

Registered: 12/26/05
Posts: 9522
Loc: Upper Midwest
I donít see the insanity to be honest. It is backwards compatible and they say so. It works well in my old BMW which calls for Dex III, and IMO if it works in that old thing I donít know why it wouldnít in other applications as well.
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 397K
2000 Toyota ECHO, 267K

#4807337 - 07/07/18 05:09 AM Re: DEX VI insanity [Re: Gimpy1]
Lubener Online   content

Registered: 01/22/11
Posts: 2612
Loc: N.Ohio
I have used dex 6 in place of dex 3 in my 97 and had no issues whatsoever.
The "thinking" man's friend.

#4807414 - 07/07/18 08:06 AM Re: DEX VI insanity [Re: Gimpy1]
bullwinkle Offline

Registered: 10/09/04
Posts: 7735
Loc: Cincinnati, OH, USA
Dex VI is also full synthetic, so it can handle the heat a lot better. I actually use it in place of Mercon in my MGM's PS system, which has burnt fluid in the past, with no issues.
06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

#4807419 - 07/07/18 08:19 AM Re: DEX VI insanity [Re: bullwinkle]
Egg_Head Offline

Registered: 10/07/12
Posts: 291
Loc: North Carolina
I used a Mityvac on a 2005 Park Ave. and got about 4 qts. out of the tranny, worked well. As others have said, you'll be in good shape with the DEX VI.
1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)

#4807424 - 07/07/18 08:24 AM Re: DEX VI insanity [Re: Gimpy1]
WishIhadatruck Offline

Registered: 05/09/06
Posts: 1398
Loc: Grand Rapids, MI
As they say, it is fully compatible. I have used Dex VI in the 4L60E in my 1996 Buick Roadmaster Wagon for well over a 100,000 miles now. It did several thousands of miles towing along with normal driving. No leaks, no issues. The trans now has 229,000 miles on it and shifts as good as it always has. I also changed over a 4T65E in my 2001 Grand Prix to Dex VI when it had 90k miles on it. I even did a UOA comparison and the Dev VI did better. No issues with that car either and I gave it away with 230k miles on it. My 4L80E in my Suburban has Dex VI in it now also, no issues.
1996 Buick Roadmaster Wagon
2014 Cruze Eco Manual
2003 2500 Suburban, 8.1L

#4807761 - 07/07/18 03:20 PM Re: DEX VI insanity [Re: Gimpy1]
Gimpy1 Offline

Registered: 08/24/17
Posts: 116
Loc: Displaced Texan in Mexico City
Thanks to all for the great advice. My mityvac came in yesterday and the DEX 6
is supposed to be delivered on monday. I plan to take a few pics and maybe do a how to. I just wish it wasn't 100 degrees outside I'm no longer used to this heat. Cheers

Edited by Gimpy1 (07/07/18 03:21 PM)