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2005 5.3L Silverado-please advise on trans fluid #4554809
10/26/17 04:50 AM
10/26/17 04:50 AM
Joined: Jul 2007
Posts: 219
NY
TurboTravis Offline OP
TurboTravis  Offline OP
Joined: Jul 2007
Posts: 219
NY
Hey guys,

I bought my 2005 Crew Cab Silverado (5.3L gas) in 2010 with about 89K miles. I am pretty sure that the previous owner said that he changed all fluids at some point with AMSOIL. Fast foward to now, it has 197K and I have changed every fluid other than the trans fluid, which is still in 'good visual condition'. Nice red color, no burnt odor. My plan was to change out a couple quarts with each oil change. Here is my question-

GM started using Dexron 6 in 2006 as far as I can tell, and advising backwards compatibility with Dexron 3. I do not know if the previous owner used 6 or 3 when he serviced it. I am assuming the best choice here would be to use Dexron 6? I would like to take advantage of some of the Valvoline Dexron 3 on clearance at Wally World, but if not I'll survive.

Thanks
Travis

Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4554821
10/26/17 05:33 AM
10/26/17 05:33 AM
Joined: Oct 2008
Posts: 19,084
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,084
Sunny Florida
While Dex III is fine your truck was factory filled with dex VI. It is a far better fluid, a much better spec.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4554863
10/26/17 06:44 AM
10/26/17 06:44 AM
Joined: Dec 2013
Posts: 2,088
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,088
socal
U can use Dex III, Dex VI, or Maxlife ATF without issue. I really like maxlife for the price so I would use that. U may want to do a filter change and replace all tranny fluid w new, that way you know what kind of tranny fluid u have in there

Last edited by barkingspider; 10/26/17 06:48 AM.

06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4554888
10/26/17 07:33 AM
10/26/17 07:33 AM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
My go-to, that I've had good luck with so far, is Maxlife multi-vehicle ATF. A pan drop + filter will be fine.


I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4554897
10/26/17 07:45 AM
10/26/17 07:45 AM
Joined: Jul 2005
Posts: 112
Tennessee
sweezy722 Offline
sweezy722  Offline
Joined: Jul 2005
Posts: 112
Tennessee
I also have a 2005 purchased in 2010 and miles when purchased and now are very similar to yours.
I changed the filter and fluid on mine using maxlife atf. The pan can be a little difficult to get off due to shift arms and exhaust. My transmission shifted way to soft with the maxlife and pulling a boat. I completely flushed the transmission fluid at the return cooler line with Dexron VI. It has been great for 30,000 miles. Dexron III also works. I change fluid every 30,000 and filter every 60,000. I hear people say good things about maxlife and that is why I tried it but it will not go back in my vehicles. The Dexron VI at walmart is cheap and very good. I do use maxlife motor oil. I have also used pennzoil platinum but the motor would weep oil. It was just a drip here or there but I hated wipping up the occasional drip.

I have a 2004 suburban that had been abused by the previous owner.. I had the transmission rebuilt and put dexron VI in it as well.

The Dexron VI seems to shift better when cold and hot.

Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4554907
10/26/17 08:03 AM
10/26/17 08:03 AM
Joined: Jan 2012
Posts: 414
hawthorne, Ca.
46Harry Offline
46Harry  Offline
Joined: Jan 2012
Posts: 414
hawthorne, Ca.
I owned a 2005 Silverado that I purchased new. The recommended fluid for it was Dexron 3 H which is as far as I know is no longer available. If I still owned the truck I would use Dexron 6 in it.

Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4554908
10/26/17 08:04 AM
10/26/17 08:04 AM
Joined: Feb 2011
Posts: 6,718
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,718
Hudson, NH
Dex III and Dex VI have different viscosity and chemistry. Dex VI is thinner. Not sure I would go that route in a Dex III tranny especially if its older. No matter what the compatibility claims are. Because transmission fluid serves a hydraulic function, so IMO going thinner may cause problems like slipping. FYI, Maxlife has changed over the years. Its latest batch is thinner than Dex VI. So IMO its quite a leap from Dex III to Maxlife.

I really like the O'rielly brand Dex III and Dev VI fluids. If you have one near you I would go that route.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4555079
10/26/17 12:12 PM
10/26/17 12:12 PM
Joined: Feb 2007
Posts: 3,642
Southeast
meep Offline
meep  Offline
Joined: Feb 2007
Posts: 3,642
Southeast
I ran Dex VI in a 1993 Jeep GC (the rare mix with the A/W trans), which originally came with Dex III. No issues and it shifted great. We put it in a friends ~2001 Chevy 1500 and it was also excellent.

IIRC, DEX III actually sheers down thinner than Dex VI during use, so the viscosity is not an issue.

-m


2018 F150
2015 crv (wifey!)
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: LeakySeals] #4555089
10/26/17 12:22 PM
10/26/17 12:22 PM
Joined: Oct 2014
Posts: 3,896
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 3,896
Utah
Originally Posted By: LeakySeals
Dex III and Dex VI have different viscosity and chemistry. Dex VI is thinner. Not sure I would go that route in a Dex III tranny especially if its older. No matter what the compatibility claims are. Because transmission fluid serves a hydraulic function, so IMO going thinner may cause problems like slipping. FYI, Maxlife has changed over the years. Its latest batch is thinner than Dex VI. So IMO its quite a leap from Dex III to Maxlife.

I really like the O'rielly brand Dex III and Dev VI fluids. If you have one near you I would go that route.


Doesn't GM say the Dex6 is backwards compatible?

Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4555126
10/26/17 12:55 PM
10/26/17 12:55 PM
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
dogememe Online content
dogememe  Online Content
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
Dex VI is better than Dex III in every way - can't go wrong upgrading to that.


2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver, 5K OCIs.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo, 10-15K OCIs.
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: CKN] #4555133
10/26/17 01:00 PM
10/26/17 01:00 PM
Joined: Dec 2005
Posts: 9,891
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 9,891
Upper Midwest
Originally Posted By: CKN
Originally Posted By: LeakySeals
Dex III and Dex VI have different viscosity and chemistry. Dex VI is thinner. Not sure I would go that route in a Dex III tranny especially if its older. No matter what the compatibility claims are. Because transmission fluid serves a hydraulic function, so IMO going thinner may cause problems like slipping. FYI, Maxlife has changed over the years. Its latest batch is thinner than Dex VI. So IMO its quite a leap from Dex III to Maxlife.

Doesn't GM say the Dex6 is backwards compatible?

Yes. I thought it was explained that the difference is that over time the Dex VI has a more stable viscosity and the two essentially end up at the same value.

My old BMW runs fine on Walmart Dex IV, I tend to think that if it is OK then most any older car would be too.


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4555135
10/26/17 01:01 PM
10/26/17 01:01 PM
Joined: Apr 2014
Posts: 842
SD - South Dakota
meborder Offline
meborder  Offline
Joined: Apr 2014
Posts: 842
SD - South Dakota
If you think is filled with amsoil, consider sampling it to see if you need to do anything.

If it is full of signature series, you may be able to go a long long time before you need to do anything at all.


Too many cars using too many different oils to list in 150 characters.
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4555163
10/26/17 01:23 PM
10/26/17 01:23 PM
Joined: Nov 2013
Posts: 358
Fly-over country
zuluplus30 Offline
zuluplus30  Offline
Joined: Nov 2013
Posts: 358
Fly-over country
Another vote for Dex VI. We’ve always done 50k fluid changes and 100k fluid/filter changes ever since Dex VI replaced III. Every trans has outlasted the engine and body including some long hard towing in a 4L60E

Last edited by zuluplus30; 10/26/17 01:25 PM.
Re: 2005 5.3L Silverado-please advise on trans fluid [Re: TurboTravis] #4555192
10/26/17 01:49 PM
10/26/17 01:49 PM
Joined: Sep 2010
Posts: 6,990
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 6,990
Texas
Mobil 1 Synthetic ATF is good in the pre Dex VI units … slightly thicker and high VI …
Know a shop owner who towed a huge cat hull (3 axle) and swears by it …

Re: 2005 5.3L Silverado-please advise on trans fluid [Re: kschachn] #4555194
10/26/17 01:51 PM
10/26/17 01:51 PM
Joined: Jan 2008
Posts: 10,666
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,666
OH
Originally Posted By: kschachn
My old BMW runs fine on Walmart Dex IV, I tend to think that if it is OK then most any older car would be too.


What atf do you use in the Toyotas? That's what I'm interested in esp for the Matrix.

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