<VV> other vehicles with the same gear lube requirements

[Jim Becker]

If there has been any consensus out of this whole discussion, it looked to 
me like everyone should read Richard Widman's article on gear oils.  You 
really need to do that.  For one thing he has a list of GLs that are OK for 
the Corvair and said "If you want me to add something I can look at it if 
you send me a link."  By the Amsoil GL-4 is in the list and their GL-5 
explicitly is not.

As far as testing their GL-5 in truck differentials goes, they could run 
them for a couple million miles and it would still be absolutely meaningless 
as far as damage to synchronizer rings goes.  Per Amsoil's own tests, their 
GL-5 is harder on synchronizers than their GL-4.  It comes in lower on the 
standard copper strip tarnish test.  If it wasn't, they could just one 
product GL-4/5 and quit making the other one.  Whether GL-5 is enough worse 
to matter, I don't know.  Again, it is enough worse that they make a 
separate GL-4 product.

>From anything I have seen so far, Amsoil GL-4 is probably fine in a Corvair 
transaxle.  Their products are probably fine but I avoid them.  So much of 
their tech data seems to get garbled through too many intermediate sources. 
Don't know what to believe.

Jim Becker

-----Original Message----- 
From: Randy Hook via VirtualVairs
Sent: Sunday, April 12, 2015 2:30 PM
To: virtualvairs at corvair.org
Subject:  other vehicles with the same gear lube requirements


Again, as far as Amsoil's concerned, their GL-5 will do just fine in our 
trannies and diffs.  And again, as far as Amsoil's concerned, their GL-4 
will do just fine in our trannies and diffs.  I called them again and asked 
for some clarification.  The tech rep explained it this way:  BOTH are an 
acceptable choice.  The difference is this: what do you want your lube to do 
for you?  Their GL-4 lube is made with the major emphasis on having smoother 
shifts.  Their GL-5 is made with the major emphasis on having extra heavy 
duty protection.  On their website, they have a field study of an 18 wheeler 
diff that ran over 520,000 miles on a single fill of their GL-5 75W-90 gear 
oil.  They actually tested a whole fleet of them.  They showed what this one 
looked like all taken apart for inspection.  Pretty impressive.  It passed 
with flying colors and was in super shape.  Check out the field study for 
yourself.  But the way I figure it, if it'll do that for an 18 wheeler diff, 
it can surely do that for me.  And so far it has.  I've used the GL-5 since 
getting the '60 on the road last June.  And all winter long it shifted like 
a warm summer's day.  Smooth as silk.  And besides all that, their gear oil 
comes with a warranty.
A suggestion:  since it's beginning to look like a lotta different companies 
lubes will work just fine, why doesn't someone start keeping track of them 
and their results instead of us hacking each other to bits because  "my gear 
oil is better than your gear oil"?   Just a thought.

Randy (Cap'n) Hook
'60 700 '64' 110/4spd
'63 '500' ragtop 110/pg
'65 Monza 4dr 84 (Soon to be '64' 110) /pg
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