so since running mobil one synthetic,
people have been saying its not good for our tranny.
when i was told about Royal Purple Synchromax, i went out to look for it.
initially i found The RP 75w 90.
when grabbing the other 3 bottles, i stumbled upon a bottle that
said "synchromax"
but it did not have an SAE rating on it...

I was told this would be best for our tranny in an older thread,
can anyone tell me if there is truth to this or should i just be puting the
RP 75w90 in?

 

I use Redline

 

bg sychoshift, gm synchromesh, royal purple synchromesh. The correct oil weight is 75w90, but these other transmission oils carry all the same properties, and them some special ones. They have all been designed around a typical front wheel drive transmission such as ours.

That is pretty much a summary of my research.

 

https://www.evolutionm.net/forums/sh...1&postcount=10

this scared me plenty...
but he mentioned the royal purple synchro max...
so im not sure if i can use the synchro max, it doesnt have a
viscosity rating on it...
any ideas?

 

It's probably very much like GM Synchromesh, which doesn't have a viscosity rating, either. I've been using it in my RA for 55,000 miles. My trans still shifts great.

 

thought mobile 1 was supposed to be one of the best.been usin it for awhile now no trouble...

 

Mobil 1 synthetic gear lube is wonderful stuff ...in my truck's rear differential.

In a 's tranny, it's not so wonderful in my experience. It's too slippery for the synchros to function as designed.

Their engine oil is one of the best, and perfectly fine for use in your RA's engine.

 

The "high-performance" GL-4 tranny oils seem to lack viscosity ratings and also seem to be thinner than stock. However, they work great. As Mysz said, GM's fluid does really well for him, and BG's synthetic fluid has done really well for me.

 

im kinda confused at what i should get now guys...
should i have grabbed the Royal purple synchromax?

or are you telling me to go with the GL-4 tranny oil?

 

GL-4 is the type of fluid our transmissions need. RP, GM Synchromesh, and BG Synchroshift are all GL-4 fluids.

 

shows what i know about tranny fluid...
so if i went and bought the royal Purple Synchromax,
ill be all set,
and much better than where i am now with the Mobil 1?
(just making sure)

and should i flush this?
if so... how?

 

 

just so i know im on the same page as everyone else...
if i drain my tranny and fill it with this :
http://www.rpmoil.com/index.php?main...products_id=83
i will be fine, as opposed to the problems i might have with mobil one synthetic?
(sorry to be a pain in the ***)

 

Yes.

 

yes to flush?
yes to RP Sychromax?
both?