What are your thoughts on using DEX VI in a D3 transmission? This would be going in my Tacoma. Ive heard DEX VI is a blend is that true?
Castrol DEX VI in a D3 Transmission
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Dex VI is available in Full Synthetic from Valvoline and others. As I understand it it is a very sophisticated specification that is a fantastic fluid.
Originally Posted By: SteveSRT8
Dex VI is available in Full Synthetic from Valvoline and others. As I understand it it is a very sophisticated specification that is a fantastic fluid.
Great.
Dex VI is available in Full Synthetic from Valvoline and others. As I understand it it is a very sophisticated specification that is a fantastic fluid.
Great.
I would hestitate to use DexVI in DexIII speced transmissions. FYI, I tried it in my 00 Maxima and it slipped like crazy.!!!
It is a marvellous formulation if the transmission was speced and designed for lower viscosity ATF. Yours aint' designed for it.
It is a marvellous formulation if the transmission was speced and designed for lower viscosity ATF. Yours aint' designed for it.
Originally Posted By: MaximaGuy
I would hestitate to use DexVI in DexIII speced transmissions. FYI, I tried it in my 00 Maxima and it slipped like crazy.!!!
It is a marvellous formulation if the transmission was speced and designed for lower viscosity ATF. Yours aint' designed for it.
+1
Dex VI is thinner than a typical dex III.
Use Castrol Import DexIII for your Toy:
Typical Dex III
Vicosity at 40C = 36.3 cSt
Viscosity at 100C = 7.4 cSt
Castrol Import
Vicosity at 40C = 36.6 cSt
Viscosity at 100C = 8.0 cSt
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_ImportMV.pdf
Dex VI
Vicosity at 40C = 29.8 cSt
Viscosity at 100C = 6.0 cS
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_DexronVI.pdf
I would hestitate to use DexVI in DexIII speced transmissions. FYI, I tried it in my 00 Maxima and it slipped like crazy.!!!
It is a marvellous formulation if the transmission was speced and designed for lower viscosity ATF. Yours aint' designed for it.
+1
Dex VI is thinner than a typical dex III.
Use Castrol Import DexIII for your Toy:
Typical Dex III
Vicosity at 40C = 36.3 cSt
Viscosity at 100C = 7.4 cSt
Castrol Import
Vicosity at 40C = 36.6 cSt
Viscosity at 100C = 8.0 cSt
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_ImportMV.pdf
Dex VI
Vicosity at 40C = 29.8 cSt
Viscosity at 100C = 6.0 cS
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_DexronVI.pdf
Maxima says that Dex VI didn't work for a Dex III application, but Dex VI is backspeced for all Dexron ATF applications. Lots of people are using it in older transmission and having good results. Dex VI is more sheer stable and just a higher performing fluid spec, and probably isn't all that thinner in service.
Originally Posted By: mechanicx
Maxima says that Dex VI didn't work for a Dex III application, but Dex VI is backspeced for all Dexron ATF applications. Lots of people are using it in older transmission and having good results. Dex VI is more sheer stable and just a higher performing fluid spec, and probably isn't all that thinner in service.
I won't dispute the literature on back specing. All I can say is my transmission like thick ATFs like Castrol Import ATF, I tried DexVI and my transmission DIDNOT like the formulation. Period, had to dump it and put in thicker ATF.
Maxima says that Dex VI didn't work for a Dex III application, but Dex VI is backspeced for all Dexron ATF applications. Lots of people are using it in older transmission and having good results. Dex VI is more sheer stable and just a higher performing fluid spec, and probably isn't all that thinner in service.
I won't dispute the literature on back specing. All I can say is my transmission like thick ATFs like Castrol Import ATF, I tried DexVI and my transmission DIDNOT like the formulation. Period, had to dump it and put in thicker ATF.
That may not apply to any Nissan product. Could be the result of an issue in yours alone.
Originally Posted By: mva
Originally Posted By: MaximaGuy
I would hestitate to use DexVI in DexIII speced transmissions. FYI, I tried it in my 00 Maxima and it slipped like crazy.!!!
It is a marvellous formulation if the transmission was speced and designed for lower viscosity ATF. Yours aint' designed for it.
+1
Dex VI is thinner than a typical dex III.
Use Castrol Import DexIII for your Toy:
Typical Dex III
Vicosity at 40C = 36.3 cSt
Viscosity at 100C = 7.4 cSt
Castrol Import
Vicosity at 40C = 36.6 cSt
Viscosity at 100C = 8.0 cSt
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_ImportMV.pdf
Dex VI
Vicosity at 40C = 29.8 cSt
Viscosity at 100C = 6.0 cS
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_DexronVI.pdf
Thandks for the info.
Originally Posted By: MaximaGuy
I would hestitate to use DexVI in DexIII speced transmissions. FYI, I tried it in my 00 Maxima and it slipped like crazy.!!!
It is a marvellous formulation if the transmission was speced and designed for lower viscosity ATF. Yours aint' designed for it.
+1
Dex VI is thinner than a typical dex III.
Use Castrol Import DexIII for your Toy:
Typical Dex III
Vicosity at 40C = 36.3 cSt
Viscosity at 100C = 7.4 cSt
Castrol Import
Vicosity at 40C = 36.6 cSt
Viscosity at 100C = 8.0 cSt
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_ImportMV.pdf
Dex VI
Vicosity at 40C = 29.8 cSt
Viscosity at 100C = 6.0 cS
http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_DexronVI.pdf
Thandks for the info.
I really don't think the thinner viscosity is the issue. Besides the fact that Dex VI sheers less and that it is backspeced, do transmissions slip when they the fluid gets a little hotter maybe 10-20 F than normalThat's about all it will take to drop it the 1.4 cST. ? No, because the transmission has the capacity to regulate pressure.
Now granted you could make the argument that Dex VI will always be thinner still and Dex III has more VII and is not as thin when hot and that maybe an older transmission can't maintain required pressure. What is the minimum pressure needed, maybe less than 2cST?
I won't discount totally that it might not work in some older/worn Dex III transmission. One issue might be that the trans needs to adapt to the new fluid over time or needs to be reset by unhooking the battery or resetting the PCM's codes. Dex VI is just a better fluid worth its price, but maybe Mobil 1 "Dex III" would be another upgrade option.
Now granted you could make the argument that Dex VI will always be thinner still and Dex III has more VII and is not as thin when hot and that maybe an older transmission can't maintain required pressure. What is the minimum pressure needed, maybe less than 2cST?
I won't discount totally that it might not work in some older/worn Dex III transmission. One issue might be that the trans needs to adapt to the new fluid over time or needs to be reset by unhooking the battery or resetting the PCM's codes. Dex VI is just a better fluid worth its price, but maybe Mobil 1 "Dex III" would be another upgrade option.
JHZR2
Staff member
The dex III will shear to as low as the dex VI at some short point after being put in service. I do not see an issue viscosity-wise with running VI.
That said, there may be some chemistry differences that really make VI only suitable for GM ATs. It could be that it is only speculation beyond that. That is speculation on my part, but I think nobody really knows, and until folks have 100s of thousands of miles on single units from other manufacturers speced for III AND running VI, we will not really know...
That said, there may be some chemistry differences that really make VI only suitable for GM ATs. It could be that it is only speculation beyond that. That is speculation on my part, but I think nobody really knows, and until folks have 100s of thousands of miles on single units from other manufacturers speced for III AND running VI, we will not really know...
Quote:
Dex VI is backspeced for all Dexron ATF applications.
Where is this documented? Dex-VI is back-spec'ed for all GM Hydramatic transmission applications and certain Allison transmissions. Where have you seen the others?
By the way, GM set the performance spec for Dex-VI that can only be met by a syn-blend or better. Of course, there are several syn-blend and Full Synthetic Dex-III fluids available.
I'd stick with a Dex-III fluid in a transmission that originally called for it. For example, The Aisin-Warner transmissions in my Volvo and my Tundra both get Dex-III fluid.
Dex VI is backspeced for all Dexron ATF applications.
Where is this documented? Dex-VI is back-spec'ed for all GM Hydramatic transmission applications and certain Allison transmissions. Where have you seen the others?
By the way, GM set the performance spec for Dex-VI that can only be met by a syn-blend or better. Of course, there are several syn-blend and Full Synthetic Dex-III fluids available.
I'd stick with a Dex-III fluid in a transmission that originally called for it. For example, The Aisin-Warner transmissions in my Volvo and my Tundra both get Dex-III fluid.
That is an interesting point about the additive compatibility. Dexron is a GM spec for GM transmissions that other makers sometimes speced in non-GM transmission. You'd assume that Dexron VI would have to have the right chemistry for Dex III. But did these other makers get the friction characteristics right for Dexron in the first palce? All that makes you wonder just how far off of Dexron III could a multi-vehicle fluid like Castrol IMV.
Sometimes transmissions can shift funny for awhile after a fluid change no matter what you put in. Maybe the new Dex Vi
I fluid dislodged something, and a second change to Dex III cleared it out? Maybe the trans needs to relearn because the old fluid was worn out?
You have to figure GM tested out the viscosity, pressure and frcition modyfing compatibility before dropping Dex III and backspecing Dex VI. But maybe only for their AT?
Sometimes transmissions can shift funny for awhile after a fluid change no matter what you put in. Maybe the new Dex Vi
I fluid dislodged something, and a second change to Dex III cleared it out? Maybe the trans needs to relearn because the old fluid was worn out?
You have to figure GM tested out the viscosity, pressure and frcition modyfing compatibility before dropping Dex III and backspecing Dex VI. But maybe only for their AT?
Originally Posted By: Ken2
Quote:
Dex VI is backspeced for all Dexron ATF applications.
Where is this documented? Dex-VI is back-spec'ed for all GM Hydramatic transmission applications and certain Allison transmissions. Where have you seen the others?
By the way, GM set the performance spec for Dex-VI that can only be met by a syn-blend or better. Of course, there are several syn-blend and Full Synthetic Dex-III fluids available.
I'd stick with a Dex-III fluid in a transmission that originally called for it. For example, The Aisin-Warner transmissions in my Volvo and my Tundra both get Dex-III fluid.
I meant for GM AT applications. As far as GM is concerned Dex III ATF doesn't exist anymore. If you look at ATFs like Mobil, they say Dex VI is a higher performing fluid in place of Dexron III. Did they leave non-GM transmissions high and dry? I don't know, but they both had to known about other transmission and they make no exceptions for them that I've seen. The point is the viscosity isn't that far different and its speculative whether it matters. If you disregard viscosity Dex VI is a much higher performing spec. Why would GM be able to back spec Dex VI in their transmission and other Dexron transmissions can't? I'm not totally discounting it. That's why I said maybe Mobil 1 Dex/merc could be another option for an upgrade.
Quote:
Dex VI is backspeced for all Dexron ATF applications.
Where is this documented? Dex-VI is back-spec'ed for all GM Hydramatic transmission applications and certain Allison transmissions. Where have you seen the others?
By the way, GM set the performance spec for Dex-VI that can only be met by a syn-blend or better. Of course, there are several syn-blend and Full Synthetic Dex-III fluids available.
I'd stick with a Dex-III fluid in a transmission that originally called for it. For example, The Aisin-Warner transmissions in my Volvo and my Tundra both get Dex-III fluid.
I meant for GM AT applications. As far as GM is concerned Dex III ATF doesn't exist anymore. If you look at ATFs like Mobil, they say Dex VI is a higher performing fluid in place of Dexron III. Did they leave non-GM transmissions high and dry? I don't know, but they both had to known about other transmission and they make no exceptions for them that I've seen. The point is the viscosity isn't that far different and its speculative whether it matters. If you disregard viscosity Dex VI is a much higher performing spec. Why would GM be able to back spec Dex VI in their transmission and other Dexron transmissions can't? I'm not totally discounting it. That's why I said maybe Mobil 1 Dex/merc could be another option for an upgrade.
Originally Posted By: SteveSRT8
That may not apply to any Nissan product. Could be the result of an issue in yours alone.
It doesn't! I'm using it in my car with no issues. I think that it was just his. I don't know why people keep saying that it's thinner but won't state the WHOLE TRUTH? Yes Dex VI starts off thinner than the Dex III but Dex VI is shear stable and stays in the viscosity range while Dex III sheared below Dex VI viscosity (thinner than Dex VI). This information is proven and all over the internet.
That may not apply to any Nissan product. Could be the result of an issue in yours alone.
It doesn't! I'm using it in my car with no issues. I think that it was just his. I don't know why people keep saying that it's thinner but won't state the WHOLE TRUTH? Yes Dex VI starts off thinner than the Dex III but Dex VI is shear stable and stays in the viscosity range while Dex III sheared below Dex VI viscosity (thinner than Dex VI). This information is proven and all over the internet.
On my '01 Grand Prix that originally came with Dex III, I did pan drops and filter chagnes at 30k, 60k, and at 90k I did a flush with Dex VI. I also had a used oil analysis done at 90k on my ATF. My pan drops get out 7.5qts of fluid and I was replacing the ATF with Mobil 1 ATF. My used oil analysis showed a viscocity of 5.72 cSt. Definitely down in the Dex VI range. It was surprising even a full synthetic ATF like M1 would shear that much.
Originally Posted By: WishIhadatruck
On my '01 Grand Prix that originally came with Dex III, I did pan drops and filter chagnes at 30k, 60k, and at 90k I did a flush with Dex VI. I also had a used oil analysis done at 90k on my ATF. My pan drops get out 7.5qts of fluid and I was replacing the ATF with Mobil 1 ATF. My used oil analysis showed a viscocity of 5.72 cSt. Definitely down in the Dex VI range. It was surprising even a full synthetic ATF like M1 would shear that much.
Thanks for this post. This proves my point I posted earler.
On my '01 Grand Prix that originally came with Dex III, I did pan drops and filter chagnes at 30k, 60k, and at 90k I did a flush with Dex VI. I also had a used oil analysis done at 90k on my ATF. My pan drops get out 7.5qts of fluid and I was replacing the ATF with Mobil 1 ATF. My used oil analysis showed a viscocity of 5.72 cSt. Definitely down in the Dex VI range. It was surprising even a full synthetic ATF like M1 would shear that much.
Thanks for this post. This proves my point I posted earler.
Very good info. Now think, Dex III is usually group II with probably a 4 cST base oil with a bunch of VII. Dex VI is probably primarily a group III ~5-6 cSt oil with little VII to shear.
Are those that deem Dex VI as too much thinner than old,sheared Dex III when the ATF is very hot, or after a spin around the block with the ATF at lukewarm temps?
Also I suspect that automatic transmissions have a big range they can compensate pressure. They're not like an engine that relies on bearing clearances, and don't the pressure circuits almost dead end against the pressure regulator?
All that said, I do think Dex VI can get thinner than Dex III when hot, but I'm not convinced viscosity is an issue.
Are those that deem Dex VI as too much thinner than old,sheared Dex III when the ATF is very hot, or after a spin around the block with the ATF at lukewarm temps?
Also I suspect that automatic transmissions have a big range they can compensate pressure. They're not like an engine that relies on bearing clearances, and don't the pressure circuits almost dead end against the pressure regulator?
All that said, I do think Dex VI can get thinner than Dex III when hot, but I'm not convinced viscosity is an issue.
For the O1M VW/Audi transmission Dex VI just doesn't play nice, atleast with mine.
I went with Redline D4 ATF, which is sheer resistant, and doesn't drop down to the Dex VI levels, the Redline tech guy said D6 was about 25% too thin, considering the bad manners, of the last batch of Maxlife ATF gave me, I believe him.
Maxlife ATF either makes Dex VI viscosity or it does VW specifications, and since it seems different batches do different things, the only way to make sure is to check the back of the jug... I didn't know, and then I looked at the back of my most recent jug, and was like... -_-...
I went with Redline D4 ATF, which is sheer resistant, and doesn't drop down to the Dex VI levels, the Redline tech guy said D6 was about 25% too thin, considering the bad manners, of the last batch of Maxlife ATF gave me, I believe him.
Maxlife ATF either makes Dex VI viscosity or it does VW specifications, and since it seems different batches do different things, the only way to make sure is to check the back of the jug... I didn't know, and then I looked at the back of my most recent jug, and was like... -_-...
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