AriK wrote:mcpeach wrote:
Is there negative experiences with mt90 out there?
thanks
Redline mt90 is considered a GL4 gear oil. The higher you go on the GL scale, the higher the EP protection. While that's good for most sports cars, our Fiats fall into a different category in regards to our transmissions. Extreme pressure additives will cause the brass synchros to pit and corrode. Fiat calls for GL1 gear oil and if you can't find this, then SAE 50 motor oil will do just fine.
I would flush it before it's too late.
Regarding the redline , I am led to believe that they don't use sulfur as the EP ingredient, but it is always worth phoning them up directly and tell them you have brass synchro in the box, here is the link from redline
http://www.redlineoil.com/product.aspx?pid=46
and I quote for the MT-90
"Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage"
"Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified"
I have redline in my box, however it is a 131 box which doesn't have brass synchro's and the rep here in OZ recommended the lightweight shockproof for me. I haven't had any issues at all.