Originally Posted By: MolaKule
Originally Posted By: galaxy333
What is it that attacks the sycro rings? Is this in a fully synthetic like this?
http://www.opieoils.co.uk/p-981-fuchs-ti...sion-fluid.aspx
Most dedicated Manual Transmission Fluids contain mostly ZDDP as the anti-wear additive with a special friction modifier for improved synchro engagement. MT's do not need Extreme Pressure (EP) additives.
The Extreme Pressure Additive (EP) of sulurized olefins and phosphorus esters is mostly used in differential gear lubes with hypoid type pinion gearing since the differential sees higher loads than do manual transmissions for cars and light trucks.
Now both types of lubes contain "yellow metal" sulfur
buffering additives generally called
anti-corrosion agents that keep any sulfur chemistries from attacking any copper alloy (brass or bronze) components.
White Paper: Technology of Manual Transmissions and Lubes
What a fantastic reply and great read on the white paper thank you for that.
I now have another question, around 10,000 miles ago I changed my gearbox oil for this:
http://www.opieoils.co.uk/p-69412-castrol-syntrans-fe-75w-full-synthetic-gear-oil-gl4.aspx
My car is a Ford Galaxy with the MT6 gearbox and that oil was supposed to be made for it, when I drained the old I assume factory oil out it was bright clear and appeared to have no bits in it, my words to my wife was I think I've just wasted time and money changing this out, after 4,000 miles the dual mass flywheel needed replacement so it went in under warranty, I later found out the dealer had been charging for parts not fitted to the vehicle so I became worried as to what they might have put in the gearbox.
It felt fine shifting etc but I felt I needed to change it, then I found out Ford had come out with a later spec oil to use so I chose the Fuchs TITAN SINTOFLUID SAE 75W-80 which matched the new spec.
When I drained out the oil yesterday it came out much darker than the first time I had changed it and it had particles of brass in it very small but if you rocked the tray I drained it into you could see it glinting in the oil, it was in suspension it didn't seem to drop to the bottom of the oil even in an hour.
What has me thinking is did they change the oil for something different which is darker but if they had it would have only been in for 4,000 miles or did the Castrol I put in go dark and get particles in it? What do you think?
The strange thing is I am a sedate driver I have never rushed a gearchange and have never heard a grind of any type so where has the particles come from in such a small time when from the original factory fill which was in for over 40,000 miles was still clear and had not visable particles in it?