royal purple manual transmission fluid
03-16-2010, 04:56 PM
#1
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royal purple manual transmission fluid
I did a search and didnt see anything on transmission fluid saw a lot of problems with peoples transmissions but i didnt see any one recomend a certin brand. I went to a few places and the only manual tranny fluid was the royal purple synchromax, and i was wondering does it matter what fluid you use as long as its designed for a manual transmission?
03-16-2010, 05:06 PM
#3
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Syncromax is the wrong fluid to use and I'm sure the reason for many people not being happy with RP. Personally I use RP MaxGear 75W90 in the transmission and differential. Redline and Amsoil are also good choices.
03-16-2010, 05:15 PM
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so i could anything that is atf 75w90? does it matter if its a synthetic oil? to me it doesnt matter the cost because whens the next time i have to change the tranny fluid 50000 miles.
03-16-2010, 11:12 PM
#7
When you have a picky transmission like the Aisin in our RX8; not just any fluid is just "fluid".
I'm using the BHR recommended Eneos 75w90. A bit loud when warmed up, but that is totally normal according to BHR. Smooth as butter.
I'm using the BHR recommended Eneos 75w90. A bit loud when warmed up, but that is totally normal according to BHR. Smooth as butter.
Last edited by SayNoToPistons; 03-16-2010 at 11:15 PM.
03-16-2010, 11:24 PM
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03-17-2010, 01:44 AM
#10
https://www.rx8club.com/showthread.p...ht=transmisson
People dont like Royal Purple tranny fluid because its a GL-5 fluid which has reactive sulfur which can chemically wear brass synchros... GL-4 Fluid has less a less reactive sulfur content or percentage which isnt supposed to wear the Brass synchros- From what I have read...
I do not have any personal experience with RP tranny fluids for the 6MT RX-8, I have used their fluids for when I had my auto RX-8. I used their ATF and 75W-90 for the diff...
Since I do not have any personal experience with RP tranny fluids in the MT RX-8 I cannot say the fluid will actually do this but I do not want to take a chance, which is why I chose Redline MT-90 for my Transmisson fluid and 75W-90 for the Diff. Rather safe than sorry....
People dont like Royal Purple tranny fluid because its a GL-5 fluid which has reactive sulfur which can chemically wear brass synchros... GL-4 Fluid has less a less reactive sulfur content or percentage which isnt supposed to wear the Brass synchros- From what I have read...
I do not have any personal experience with RP tranny fluids for the 6MT RX-8, I have used their fluids for when I had my auto RX-8. I used their ATF and 75W-90 for the diff...
Since I do not have any personal experience with RP tranny fluids in the MT RX-8 I cannot say the fluid will actually do this but I do not want to take a chance, which is why I chose Redline MT-90 for my Transmisson fluid and 75W-90 for the Diff. Rather safe than sorry....
03-17-2010, 05:05 AM
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But the people who claim their car got noticeably faster when using royal purple oil in their engine...... id say their full of it until i see some dyno charts and data logs.
it all sounds like some ricer **** to me
03-17-2010, 08:16 AM
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A lot of us who have used it have had problems. In my case, I got a 4th gear grind very shortly after starting to use it. I switched to a GL-4 fluid (Pennzoil platinum, IIRC), and it got better, but was still there.
And, for the record, I did use the Maxgear 75W90.
And, for the record, I did use the Maxgear 75W90.
03-17-2010, 08:58 AM
#13
Use the GL4, which is designed to be gentle to gold metals like brass synchros.
Many a parts counter guy will do their best to sell you the GL5, saying things like "supercedes the GL4" and/or "replaces GL4 for all uses". Nevertheless, there is a reason Mazda specs GL4 for the tranny and GL5 for the rear diff. In my reasearch this was backed up by my Amsoil rep, who suggested the same GL4 & GL5 package as spec'd above. Wasn't even a question for him, it was as simple as "Lube for a manual tranny, you need GL4."
Many a parts counter guy will do their best to sell you the GL5, saying things like "supercedes the GL4" and/or "replaces GL4 for all uses". Nevertheless, there is a reason Mazda specs GL4 for the tranny and GL5 for the rear diff. In my reasearch this was backed up by my Amsoil rep, who suggested the same GL4 & GL5 package as spec'd above. Wasn't even a question for him, it was as simple as "Lube for a manual tranny, you need GL4."
03-17-2010, 10:08 AM
#14
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i used royal purple before and my tranny was grinding from 1st to 2nd at high rpms, i then switch to redline and problem solved. Stay away from royal purple use redline.
03-17-2010, 10:41 PM
#15
well i can certainly see (different) gear oil makeing a difference on noise concerns.
But the people who claim their car got noticeably faster when using royal purple oil in their engine...... id say their full of it until i see some dyno charts and data logs.
it all sounds like some ricer **** to me
But the people who claim their car got noticeably faster when using royal purple oil in their engine...... id say their full of it until i see some dyno charts and data logs.
it all sounds like some ricer **** to me
03-18-2010, 08:39 AM
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I know many people using RP in transmissions, yes even in RX-8 transmissions, that have no issues at all. I firmly believe it's how the car is treated by owners that kill transmissions and nothing else.
03-18-2010, 09:57 AM
#18
RG, do you thing the diference between GL-4 and GL-5 is not a big deal? I think the problem that most people have with RP is that their local parts store only stock the GL-5 version which is great for the diff but not good for the trans. I deffinately do agree that our trans needs to be used properly. It does not respond well to voilence or rought shifts.
03-18-2010, 10:21 AM
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redline mt-90 in the tranny,
http://www.redlineoil.com/product.aspx?pid=46&pcid=7
and redline 75w90 + Limited Slip additive in the rear if you have L.S.
http://www.redlineoil.com/product.aspx?pid=133&pcid=4
http://www.redlineoil.com/product.aspx?pid=41&pcid=4
http://www.redlineoil.com/product.aspx?pid=46&pcid=7
and redline 75w90 + Limited Slip additive in the rear if you have L.S.
http://www.redlineoil.com/product.aspx?pid=133&pcid=4
http://www.redlineoil.com/product.aspx?pid=41&pcid=4
03-18-2010, 10:22 AM
#20
'06 copper red shinka #66
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and it is a big deal. if you put the GL-5 in your tranny kiss it goodbye after about 10k miles
they are very different.
https://www.rx8club.com/series-i-tech-garage-22/gl5-vs-gl4-gear-oil-transmission-159398/
they are very different.
https://www.rx8club.com/series-i-tech-garage-22/gl5-vs-gl4-gear-oil-transmission-159398/
03-18-2010, 01:52 PM
#22
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https://www.rx8club.com/rx-8-discussion-3/possible-clutch-bearing-transmissino-issue-184930/
03-18-2010, 03:00 PM
#23
Not all GL-5 fluids have the same amount of chemically reactive sulfur, I remember reading some have more and some have less than their stated value of GL-4 or GL-5... so far Eneos 75W-90 is the only GL-5 Fluid that works in the RX-8 Transmisson and is fine...
03-18-2010, 05:35 PM
#24
