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Unread 02-06-2008   #1 (permalink)
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Default 1990 Mustang 5.0 lx Tremec T-5 oil type ?

installing brand new T-5 from Tremec (stock type) . Which type of fluid ? I think stock called for Mercon/Dexron II.. Was going to put in Royal Purple synthetic.. Did a search on the subject with no straight answer.. The Tremec websites states " most T-5 transmissions call for Dexron II "
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Unread 02-06-2008   #2 (permalink)
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1. dissaprove of any royal purple product ever made...just cuz its expensive doesnt mean its good...JUNK

2. The factory calls for ATF III

3. i recommend using syncromesh...ive found it to have smoother shifts and protect better than the ATF
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Unread 02-06-2008   #3 (permalink)
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I believe Tremec calls for GM Synchromesh fluid. Ask rj8806, he's in tech at Tremec.

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Unread 02-06-2008   #4 (permalink)
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I was thinking the same.. Problem is I allready purchased the Royal Purple with the Tranny.. I am not big on using Synthetic products where it calls for regular oil.. Might just pick up some regular ATF and return the Royal Purple...

On that note.. it is getting harder and harder to find regular oil.. everything is Synthetic...

Transmissions and engines these days are not lasting like they used to.. Not sure if synthetic has anything to do with it....
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Unread 02-06-2008   #5 (permalink)
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Quote:
Originally Posted by zugspitz View Post
installing brand new T-5 from Tremec (stock type) . Which type of fluid ? I think stock called for Mercon/Dexron II.. Was going to put in Royal Purple synthetic.. Did a search on the subject with no straight answer.. The Tremec websites states " most T-5 transmissions call for Dexron II "
I ran Dexron III for the first 500 miles in my new Tremec T-5z and then I put in Royal Purple Synthetic ATF Dexron III compatible fluid.
It shifts very smooth.
I ran it in my old T-5 and it worked great also.
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Unread 02-07-2008   #6 (permalink)
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Quote:
Originally Posted by zugspitz View Post
installing brand new T-5 from Tremec (stock type) . Which type of fluid ? I think stock called for Mercon/Dexron II.. Was going to put in Royal Purple synthetic.. Did a search on the subject with no straight answer.. The Tremec websites states " most T-5 transmissions call for Dexron II "


ONLY USE Dexron 3 in the T5. The T5 actually uses 3 different types of materials in the blockers. The 1-2 blocker is actually made of a paper material, 3-4 is carbon fiber based and 5th is brass. Most synthetics on the market have additives that will break down the paper material in the 1-2 blockers and eventually ruin the transmission. Tremec actually tested and approved Mobil 1 synthetic and recommends, if you want to use a synthetic, Mobil 1 and ONLY Mobil 1.


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Unread 02-07-2008   #7 (permalink)
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Quote:
Originally Posted by rj8806 View Post
ONLY USE Dexron 3 in the T5. The T5 actually uses 3 different types of materials in the blockers. The 1-2 blocker is actually made of a paper material, 3-4 is carbon fiber based and 5th is brass. Most synthetics on the market have additives that will break down the paper material in the 1-2 blockers and eventually ruin the transmission. Tremec actually tested and approved Mobil 1 synthetic and recommends, if you want to use a synthetic, Mobil 1 and ONLY Mobil 1.


Richard
So it is not a good thing to run the Royal Purple MAX ATF even though it says that is reccommended for transmissions requiring Dexron III or Mercon Fluids?
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Unread 02-08-2008   #8 (permalink)
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Quote:
Originally Posted by 93mustang View Post
So it is not a good thing to run the Royal Purple MAX ATF even though it says that is reccommended for transmissions requiring Dexron III or Mercon Fluids?

Not if it is a full synthetic. Like I said, the additives in most synthetic fluids will slowly eat away at the 1-2 blockers in a T5 because they are a paper based material. Tremec has done extensive research and testing of fluids and has determined that the only full synthetic that does not harm the blockers, is Mobil 1. I don't know if that's because they don't use the same additives as the rest of the manuafactirers or not but I would trust Tremec over anyone else since they manufactured the transmission to begin with.



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Unread 02-08-2008   #9 (permalink)
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Thanks .. I will go with the Dexron III . Not a big fan of the synthetic, especially the price of the stuff.

Original clutch and Transmission went 213,000 miles with regular ATF.. Just replacing Transmission while it is out.. Had a little side to side play on the Input shaft...
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Unread 02-08-2008   #10 (permalink)
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I e-mailed Royal Purple, and this is the response that I got.

We actually recommend our RP Synchromax for your Tremec as it provides superior protection for the bearings and gears yet works great in the synchronizer to gear hubs (blockers) providing superior shifting.
The RP MaxATF is a Dexron III fluid and is a second choice within our product line.

The RP Synchromax has been used in Tremecs for a decade with excellent results and is used by rebuilders specializing in both drag and road racing applications.

Tremec recommends only one fluid in that they have chosen only to test one fluid -
Kind of like saying that Mustangs come factory equipped with Motorcraft oil filters and we have tested Motorcraft oil filters to be excellent with the 4.6L. We only recommend using Motorcraft Oil filters.

The statement regarding 'synthetics' would be as accurate as saying 'plastics' or 'rubber' components - far to general to be anything more than that.

RP recommends our Synchromax as a first choice and RP MaxATF as a second choice in Tremec manual transmissions.
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Unread 02-09-2008   #11 (permalink)
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Not sure about Royal Purple but I went to the Ford dealer today and mentioned that Dexron III is being fazed out, replaced by Mercon V ( a synthetic blend that is recommended for Dexron uses)

Furthermore the Ford Dealer advised to stay away from the Royal Purple synthetic fluid. They do not recommend using that fluid in a Tremec Transmission
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Unread 02-09-2008   #12 (permalink)
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I actually talked to Tremec when I first bought my transmission last year. They told me Dexron III. If I wanted to run something more advanced, go with GM synchromesh after 500 miles.
I'm drainning the Royal Purple and going with regular Dexron or GM sychromesh.
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Unread 02-09-2008   #13 (permalink)
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Quote:
Furthermore the Ford Dealer advised to stay away from the Royal Purple synthetic fluid. They do not recommend using that fluid in a Tremec Transmission
Do you really think they would recommend a product that they do not sell?:nogrinner

EVERY company will ONLY recommend a product if they can make a buck on it.

Thousands of Tremec transmissions have synthetics in them and wear issues are very rare to non-existent.

I've used Amsoil equivalent in my Viper Spec Tremec for 12,000 miles and no issues have surfaced. I see no reason to change it.:shiny:
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Unread 02-11-2008   #14 (permalink)
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Quote:
Originally Posted by Tominator View Post
Do you really think they would recommend a product that they do not sell?:nogrinner

EVERY company will ONLY recommend a product if they can make a buck on it.

Thousands of Tremec transmissions have synthetics in them and wear issues are very rare to non-existent.

I've used Amsoil equivalent in my Viper Spec Tremec for 12,000 miles and no issues have surfaced. I see no reason to change it.:shiny:

Since we were only taking about the T5, that's where my response came from. The T56 has a completely different blocker and syncro setup and are made up of completely different materials.


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Unread 02-19-2008   #15 (permalink)
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Quote:
Originally Posted by rj8806 View Post
ONLY USE Dexron 3 in the T5. The T5 actually uses 3 different types of materials in the blockers. The 1-2 blocker is actually made of a paper material, 3-4 is carbon fiber based and 5th is brass. Most synthetics on the market have additives that will break down the paper material in the 1-2 blockers and eventually ruin the transmission. Tremec actually tested and approved Mobil 1 synthetic and recommends, if you want to use a synthetic, Mobil 1 and ONLY Mobil 1.


Richard
I talked to Tremec tech today.
I've had the Royal Purple ATF synthetic in my T-5z for 1500 miles.They said that I would have noticed some problems by now if it wasn't working correctly. But this product has never been tested by them, so he reccommended draining it to be on the safe side. Most companies won't tell Tremec what type of additives are used, so that is why they only test the major ones. And for synthetics as stated by Richard, Mobil One is reccommended and has been tested. Other synthetics can actually be too slick and cause slipping.
I was told that regular Dexron III works the best.
For my car application, which is a street legal car, mainly used for drag racing, he reccommended GM Synchromesh. You can get it in the Pennzoil brand in the gear oil section at most parts stores.
I may just stick with the regular old Dexron III in the Valvoline brand.
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