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

[John Kolak]

Last I heard, the gear oil question is obsolete because all modern
gear oils are now yellow metal friendly.

John

On Tue, Nov 22, 2016 at 7:56 AM,  <accessys at smart.net> wrote:
>
> I run syrnthetics in my tranny
>
>
> Bob (auto and final drive)
>
>
> On Mon, 21 Nov 2016, MUTS wrote:
>
>> Date: Mon, 21 Nov 2016 15:49:56 -0500
>> From: MUTS <muts at verizon.net>
>> To: type2 at type2.com
>> Subject: [T2] link to Amsoil ASTM-D130 tests of gear oils safe for yellow
>>     metal synchros
>>
>>
>> http://xlforum.net/vbportal/forums/showthread.php?t=1533539
>>
>> Add to list: NAPA 80-90 GL3-4 oil, part #75-210
>> Sta-lube 85-90 Gl4 gear oil part # SL24239
>>
>>
>> I have an 091 trans in a 75 bus that was likely changed to a valvoline gl5
>> gear oil only a few thousand miles ago, but has sat when the was losing
>> power (due to slipping clutch, changed a year ago, but then was leaking oil,
>> then changed trans shaft and crank seals last month and on warmup (no axles
>> attached yet) the engine oil leak is gone, but oil was seen to leak  gear
>> oil from above nosecone- lost over a cup- stopped engine, cleaned it up, ran
>> it again to see start of leak and no more leak!   Oil filler plug showed
>> level was below fill hole. Next day did same- warmup, foamy oil came out
>> over nosecone, likely from vent hole? Stopping engine, cleaning it and
>> running again- no more leak! Now pulled fill plug, level is at least an inch
>> below hole, and finger came out with foamy oil on it.  Drained all the oil,
>> looks clean, magnet showed one tiny sliver.  Could it be water in this
>> fairly new oil? Based on local sources, will use the NAPA $5 a qt gl3-4 oil.
>>
>>   What I do not understand is the dual nature of my 091 trans- has a
>> hypoid Ring & Pinion, but yellow metal in the synchros?
>>
>> These synchros  will be damaged by the 2x level of sulfur found in Gl-5 vs
>> GL-4 gear oil made to protect modern manual hypoid gearboxes?  This level
>> will prematurely eat the synchros and not let them grab.
>>
>> The amsoil test lists GL5 brands that pass the test as safe for yellow
>> metal.
>>
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