Hey guys, awesome thread! I am waiting until I get to 1500 miles to do my tranny/diff fluid change, just to make sure I grind as much of the extra metally crap from work-in before I drain it. Just wondering, I see a lot of you used Red Line, and only some use Royal Purple. How did you guys make your decision as to what brand to use? Is one higher performance than the other?
|
Originally Posted by zenmoused
Just wondering, I see a lot of you used Red Line, and only some use Royal Purple. How did you guys make your decision as to what brand to use? Is one higher performance than the other?
|
Originally Posted by zenmoused
Hey guys, awesome thread! I am waiting until I get to 1500 miles to do my tranny/diff fluid change, just to make sure I grind as much of the extra metally crap from work-in before I drain it. Just wondering, I see a lot of you used Red Line, and only some use Royal Purple. How did you guys make your decision as to what brand to use? Is one higher performance than the other?
|
Okay, so really no tests to compare them, but they're both premium as far as everyone's concerned? RP has a big explanation on their site of how well their engine oil works in rotaries- I wonder why they'd be so uncertain about tranny oil? Well, any advantage towards the RP side I'm sure would be minimal (if any), and Red Line seems tried and proven. I'll throw some of that in when the miles roll around. Thanks for your replies!
|
Originally Posted by zenmoused
Just wondering, I see a lot of you used Red Line, and only some use Royal Purple. How did you guys make your decision as to what brand to use? Is one higher performance than the other?
Note, I did not use the Red Line based on a belief that it is "better" for the transmission and that the tranny will last longer. It was stricly based on the improved shifting characteristics. My take is that any quality gear oil of the appropriate grade will do fine for the expected lifetime of my 8, particularly since it is my daily drive and will probably never see a track or autocross event. I have never used RP, but based on comments here it sounds like it does the same thing. |
Using Redline in my old WRX was a nightmare. Oil was too "slippery" which wouldn't let the synchros work correctly and caused the gears to grind when downshifting.
|
Alright, I'm about to order my fluids and washers from Rosenthal. One question first. I asked the Rosenthal Mazda people about how many quarts of each fluid I should buy. I was under the assumption that I only needed two of each since neither the tranny or diff. is more than 2 quarts, but they said somethin about most 8 owners buying three bottles of the tranny fluid and two of the diff. Is this correct or do I only need two bottles of each? Thanks!
|
Only two of each. 1.8 qts tranny, 1.4 qts rear diff. Unless the mechanic spills it all over himself while refilling, two is more than enough.
|
Originally Posted by MadDashRX8
Only two of each. 1.8 qts tranny, 1.4 qts rear diff. Unless the mechanic spills it all over himself while refilling, two is more than enough.
|
Nope, not quite. Get two quarts of each type of fluid (4 qts total). Put 1.8 qts of MT90 in the tranny, and 1.4 qts of 75W90 in the rear differential.
|
Okay all. Went to local shop to arrange for them to do a variety of work for me - such as change tranny\diff fluids to redline... I was asked what the clutch\synchros etc were made of and whether or not I knew that the redline fluids would not over time degrade performance by attacking those materials... Well, i said, people on the forum do it all the time. To which you can imagine his response... something to do with lemmings...
So, to the tech heads here, are there any materials issues that we may not have thought of with the use of Redline fluids in our tranny\diff?? This shop has a long record of creating competition Porsche and other cars for over 20 years and knows what they are talking about. He does not want do the work without knowing it will not create long term issues. I am okay with that. |
Originally Posted by MadDashRX8
Nope, not quite. Get two quarts of each type of fluid (4 qts total). Put 1.8 qts of MT90 in the tranny, and 1.4 qts of 75W90 in the rear differential.
|
Specs.....
The specs call for "GL5" fluid in the rear end, tends to be very slippery, due to additives that contain sulphur. These same compounds can attack brass/copper etc. which may be used in the gearbox. So the specs call for "GL4" for the box. Basically the same stuff, but no sulphur.
I don't think Redline uses the sulphur additives any more, but to be safe, always go with the rating on the bottles. I personally use a bit (30%/40%)of MTL in with my MT90, found it made a huge difference to the shifting feel. Not recommending, just saying what worked for me. :) S |
1 Attachment(s)
GL4 or GL5 can be used in the gear box according to manual, but only GL5 can be used in the LSD.
Originally Posted by StealthTL
The specs call for "GL5" fluid in the rear end, tends to be very slippery, due to additives that contain sulphur. These same compounds can attack brass/copper etc. which may be used in the gearbox. So the specs call for "GL4" for the box. Basically the same stuff, but no sulphur.
I don't think Redline uses the sulphur additives any more, but to be safe, always go with the rating on the bottles. I personally use a bit (30%/40%)of MTL in with my MT90, found it made a huge difference to the shifting feel. Not recommending, just saying what worked for me. :) S |
Thanks for the clarification guys. Going with the Redline MT90 GL-4 for the tranny and 75W90NS GL-5 for the differential.
|
If I remember correctly, somewhere in this thread it states to use 75W90, not 75W90NS
|
You dont want to use Redline 75W90NS in your differential because it doesn't have the Limited Slip friction modifiers.
Originally Posted by willhave8
Thanks for the clarification guys. Going with the Redline MT90 GL-4 for the tranny and 75W90NS GL-5 for the differential.
|
Originally Posted by QBallz
You dont want to use Redline 75W90NS in your differential because it doesn't have the Limited Slip friction modifiers.
|
I just put a RP shifter in my car, and because of this, I still have the center console cover off.
I started thinking- can you fill the tranny from inside the car? When you put the shifter in, you can basically see right into the tranny. If I drain out all of the fluid, put the drain plug back in, and then pour fluid into the shifter hole will this work? I used to do this all the time with my DSM tranny- there was a bolt on the top that you could take out and fill the tranny from instead of using the "fill hole." Of course, I'm still talking about taking out the fill plug to figure out when it's full, but putting the fluid in from the top instead of side, which seems much easier and less messy. Has anyone tried this or know enough about the insides of the transmission to know if it will work? |
It sounds to me like adding some MTL to the MT-90 oil will smooth out the shifting. Is this safe to do? How much is too much? I was thinking of going one and half MT-90 and the rest MTL.
|
Update - My Redline fluids are in. MT90 in the tranny and 75W90 in the differential. First impressions are that I don't hear the chattering when I am sitting in the driveway idling in neutral. Things are much quieter now. Feels great on the road but as others have said before, it already felt good.
|
I put the Red Line stuff in today. I love it. I followed the directions using the 1/2" tubeing. It worked fabulous. The only thing I would do different next time is wear latex gloves. That gear oil smell is hard to get rid of off your skin. Thx for the DIY.
By the way the notcheyness is gone and my coffee warmer is now much cooler. I took a long trip today and it's posible I'm getting a smidgen better gas milage too. Waaaahoooooooo! |
A few questions...
Just to verify, the tranny and differential hold 1.8 and 1.4 quarts respectively, correct?
Also, how many washers do I need? Rosenthal Mazda lists \"Transmission Seal Front\" and \"Transmission Seal Rear\"... are these what I need?. I only count two types of washers, but there\'s 4 holes total. Unless I\'m completely off the trail and need a whole different washer animal... somebody help me out. What do you recommend, redline MTL or redline MT-90? |
Originally Posted by Rootski
Just to verify, the tranny and differential hold 1.8 and 1.4 quarts respectively, correct?
Originally Posted by Rootski
Also, how many washers do I need? Rosenthal Mazda lists \"Transmission Seal Front\" and \"Transmission Seal Rear\"... are these what I need?. I only count two types of washers, but there\'s 4 holes total. Unless I\'m completely off the trail and need a whole different washer animal... somebody help me out.
What do you recommend, redline MTL or redline MT-90? |
I put MT-90 in my trans and 75W90 in the diff. I replaced all 4 washers. Also, note the socket sizes 23mm and 24mm. Most peeps don't have these, you will need them. Also, deep wells won't fit.
|
All times are GMT -5. The time now is 05:01 PM. |
© 2024 MH Sub I, LLC dba Internet Brands