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

[accessys at smart.net]

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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