[T2] link to Amsoil ASTM-D130 tests of gear oils safe for yellow metal synchros

[MUTS]

http://xlforum.net/vbportal/forums/showthread.php?t=1533539
This is of great concern to early car owners like Corvair.  Current 
hypoid transmissions using GL-5 with no yellow metals can have  twice 
the sulfur compound that eats yellow metals, and the copper strip test 
indicates the safety of the oil as to its rate of corrosion. Not all 
synthetics are safe- IE, the Lucas one is rated 4 on the strip test, 
turned the strip jet black (maximal corrosion) in the 24 hr test.

MUTS  = Michael's Ultimate Thumb Saver oboe, clarinet support
93 Chevy Roadtrek 210P
78 VW Westfalia Camper

On 11/22/2016 12:28 PM, david raistrick wrote:
> On Mon, Nov 21, 2016 at 9:37 PM, John Kolak <jkolak at gmail.com> wrote:
>> Last I heard, the gear oil question is obsolete because all modern
>> gear oils are now yellow metal friendly.
>>
>
> not really - even in the new Mini world (2002+) we deal with it, some
> of the transaxles only take gl4 - the gl5 additives will do the usual
> (some of the bmws, too, come to think of it, but I mostly dont work on
> those).   Some of the synthetics are safe, but the dyno gl5's are just
> as bad as they've always been.