I still run the RP GL5 stuff (that gave me transmission problems) in my diff without issue. No brass syncros to eat away back there.

 

use GL4 tranny. Soft metal ftw :o

 

hey guys i have a few dumb questions :'-(

im reading that chart with the viscosity b4 and after the testing and looking how bad royal purple did, there is now doubt in my mind thats why my tranny has been messing up so bad. I am going to be switching over to somethin else. What id like to know is why RP seems to be popular when the tests show it has a signifigant reduction after testing, is it the brand name that made it a popular choice?

ill admit i only put it in because i hear of word of mouth how good their products are. The initial viscosity in the chart is very good...is this the type of fluid you use for short term useasge, sort of like using it for a track day or two then swapping out? I used it on a street driven car for a little over a year and i admit for the 1st 2 months my shifts were incredible...precise and effortless. Now shifting is a real chore.

A side question, i saw seafoam has a tranny cleaner, since ive been using this RP stuff, id like it all gone, is the tranny cleaner ok to use in our tranny to do a flush and start off with fresh fluid? I want to make sure i give the tranny a fresh start...there may still be hope i can salvage this tranny :-)

As for the diff ive been using Mobil 1, how can i tell if there is something wrong with it...as far asd i kno ive had no problems in the dif lol...sorry if this Q was a thread HJ

 

I use GL4 to play it safe, but I still don't quite understand the real-world application.

GL-5 sounds like it would be better, except it eats yellow metal (synchro rings).

So, are there transmissions out there that *don't* use yellow metal? How common is that? And why would a Mfr list both fluids as an option for a tranny which does use brass alloys?

 

In my expierence if you use gl5 in a gl4 transmission in cold weather it can make it very stiff to shift.

 

hate to admit my suspicions with RP not performing its best during cold temps. fluids were drained after only a few thousand miles of use... and the rest RP was used up and blended with valvoline. needless to say, occasional shift imperfections are still there, but it was dramatically improved.

i have one word: SYNCHROMESH

it will most likely be blended with valvoline durablend(synthetic blend) and even then, i'm hesitant. it'll most likely be reserved for the diff... maybe blended with valvoline high performance regular fill.

--input needed--

 

i might have heard about that between a tech at a miata meet ( i did used to own one you know).

and i've also heard of synchromesh being used.... and also popular in the honda crowd.

on a side note, have you checked walmart for your motorcraft fluids? you might want to check that out... i might have seen that there and wanted to try it out.
but if you go ahead and try it out first, let me know of your immediate results.

wait, i might see you 2morrow at the meet. more details to come.

 

The Eneos made the tranny silky smooth.
I went back to Redline only because of the worry about the "yellow metal" issue.
Redline is good, but not as nice as the Eneos.
If the "yellow metal" issue is a non-issue, then I will go back to the Eneos.

 

have either of you had any expierence with amsoil gear fluid? I was thinking about useing that in my diff and tranny.

 

It took quite a few miles and lots of track sessions to realize my issues with GL5 in the trans. All of a sudden I didn't have 4th gear on the track @ ~90mph. Not once, but all weekend. Made probably 70+ tries for 4th gear.

Swapping out to a GL4 resolved the issue without a rebuild. No grinding or any issues after the swap. Was running/shifting fine the last time the car was run.

 

Fantastic stuff. Love it, have had much success with it in several vehicles that have seen hard track use.


Transmission:

http://www.amsoil.com/storefront/mtf.aspx


Differential:
street:
http://www.amsoil.com/storefront/svg.aspx


track:
http://www.amsoil.com/storefront/svt.aspx



GEAR OIL IS CHEAP! CHANGE YEARLY!

 

Where did you find them and how much does it cost per quart?

 

Motorcraft tranny oil should be going in tomorrow.

 

anyone with any experience on pennzoil synchromesh and valvoline durablend and/or synchromesh durablend together?

 

We should remember that years ago, when everyone was on the Royal Purple versus Redline hype, many people chose Royal Purple for their transmission because those idiots at Royal Purple told us it would work great. I remember calling them myself and getting the same encouragement.

Luckily, I decided to go with Redline for my trans and Royal Purple for my differential.

Can Royal Purple be sued for this?

 

Sorry but what one does to their car is their responsibility alone.

 

Ray you know as well as I do how much bad advice is there out there on the 'net. I can't believe people are still willing to just take some guy's word for it. Mine, yours or otherwise. Especially when said guy has a financial interest in selling that product, like a sales rep from Royal Purple that you get on the phone. Like the lubricants I just recommended in this very thread. I have used them, I like them but what does someone across the world know about who I am? I haven't run any scientific studies on any of that stuff. I put it in my car. That is all.

People need to take responsibility for their actions. There is a lot of money at stake when you are talking about a motor vehicle. Why rely on someone else when they are not going to pay for your car if it breaks? Some vendors may have a conscience but that doesn’t mean they have the knowledge. And if they are turning a profit off of their recommendations their motivations should always be scrutinized.

 

learned a lot--changing out to mobil 1 tomorrow for the trans==it doesnt have sulfur in it per report.
OD

 

I have penzoil gl4 in my tranny right now and it feels about the same as factory stuff. it has been in there for almost 8 months and feels the same as the day i put it in.

 

so what weight should we be using for out transmission and diff....Is 80/90 for the tranny good and same for diff?

 

I've always used Redline MT-90 (GL4) in all my Mazdas. Good stuff.

 

Put in the Motorcraft last night and ended up putting about 250 miles on the car last night. There's a distinct improvement in smoothness when the transmission is warmed up. It now slides from gear to gear effortlessly. The tranny also seems to reach operating temperature quicker. The 1-2 shift when cold still requires a delicate touch. It feels like the Motorcraft isn't as "clingy" as the Redline because even if the tranny is hot, when you let the car sit for a little bit of time, the first couple shifts after you start driving again is a little more notchy.

The miata.net guys report this oil requires some miles to break in, so I'm hoping it'll get even better in the coming days.

 

mobil one works nice--trans is actually quieter(noticeably so) and the shifts are just as good if not a little better. mine is a +60K trans.
Mobil one is easy to get around here.
OD

 

Royal Purple has made some of us a bit gunshy and so we're hesitant to touch anything with a GL-5 rating.

 

Well I'm sure a lot of people understood the GL-5 issue before regarding synchros, but I think some of us had a lapse in judgment and decided to take Royal Purple's claims that even though it was a GL-5 it wouldn't result in any synchro damage at face value. Now of course we're a bit shy about believing any other company claiming their GL-5 oil doesn't hurt synchros. Regardless, I think I've found a transmission oil that I feel comfortable sticking with. The Motorcraft really is nice and one other rx8club member put it in at the same time I did and reports the same.