I finally go to the bottom of this Manual Trans Fluid issue. I called Quaker State's
tech info line. After running the # for it (MS-9224), he told me that it is (drum roll)
called "Synchromesh" and is made by Penzoil. A 75W85 API GL3 Gear Oil.
This however is NOTregular gear oil. It is kind of a hybrid between gear oil and
motor oil but not a "mix" of the two.The GL# rating says that there is
considerably LESS sulphur in the oil. The added sulpher increases the pressure
and heat the oil can withstand. GL5 has the most sulphur and is used almost
exclusively in rears. Apparently the metals they use in the gears and to coat
the gears with is harder and more resistant to the corrosion that the sulphur causes.
Normally a GL4 gear oil is used in Manual transmissions because the metals are
"softer" and the GL4 oil has about half of the sulphur of the GL5. But over the long
haul, there is still usually some corrosion and varnish that occors.
As far as he knew though, no one makes a direct synthetic replacement for it.
But the good thing about it is that it is a pretty good oil in it's own right.
It is good for up to 300 degrees and has a pour point of -50 degrees.
The severe service change interval is listed as 18,000 miles.
That's all I have for ya everyone. If you have any more questions, drop me a line!
Bill Maurits
98 CC 5.2L 5-spd 3.55 sg
....................................
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