Sounds as if you agree with me, as you mixed it with the MT 90, didn't go stright synchromesh.
From Redline's page on MT90 "MT-90 is a thicker 75W90 version of MTL.". So yes it is 75W90.
http://www.redlineoil.com/products_gearlubricants.asp?pvID=74&prodID=57&subcatID=18
Better shifting and better protection are 2 diffferent things. Thinner makes for better shifting, thicker is more protection. Life's full of trade offs.
I said that Snchromesh does not even have a weight on it, and does not provide adequate protection all by itself for an AWD transmission. Apparently you are in agreement, as you mixed it with MT 90.
If the Synchromesh is thick enough, why did you mix it with MT90? Cause it's not, it is thinner. It's the equivalant of 5W30 thickness wise. I'm trying to keep people from dumping in straight Synchromesh, unless they are willing to change the gear oil evert 10K miles.
It's not a post telling people it doesn't help synchros shift better. It has a special friction modifier in it that helpse synchros work better. But it is not GL4 or Gl5 rated, nor does it have a weight listed on it.
It's not a post aimed at you, I never said not to put a quart in with the MT90.
Would you put motor oil in your car that has no weight listed on it? NO! Then why put gear oil in that doesn't.
If you mix 1 quart in with some 75W90 gear oil, I think that's ok. I know the 75W90 does not shift as smoothly, but it protects the tranny better.
I'm on my second tranny, and like I said I used straight sychromesh in the first tranny, based on the advice from people on the DSM boards, etc.. I wish I never would have.
I'm trying to save people from having to replace a tranny prematurely. I don't know why you want to argue with me.
And frankly, doesn't look like you have done the reasearch I have either, I've done plenty.
Does Synchromesh meet the manufactures specs? NO, do you see them listed on the bottle? NO
"A post on the message board at
www.oilanalysis.com found Synchromesh to consist of a 5W30 non-detergent oil with a friction modifer and an EP (extreme pressure) additive."
http://www.stealth316.com/2-pennzoil-synchromesh.htm
People considering using it: Mix one quart of Synchromesh with the rest 75W90.