Hi Rick..same way I felt--- but thrust pins in thrust block in 8 3/4 diff
discussed in other email are in fact brass. Someone noted maybe only in sure
grip..do not know, but do know in several I took apart they were there. And
important functionally. = ? Matter of degree? GL-5 eats brass if you believe
article. (due to sulphur lube in it)
That link is a great reference..main
point is synthetic anything in oils is plain better than non synthetic, ---but
have to watch additive packages. Same as motor oil, and flat cams.
…..
SAE test/paper I saw / read about had older 350 camaro, I think it
had 85k miles, running mobil 1, lab test every 1000 miles, oil still OK at 18000
but had lost additives unacceptably by then ; made me feel Ok about 10 k mile
change with Mobil 1. Drove JEEP 4.0 330 k miles on this idea , engine still
perfect . 4.0 a great engine anyway, but you get it. (99-01 not so good --head
cracks,-- however) .Understand all those who are happy with old arrangement.
Your call. New oil IS better.
Air cooled Onan generator I take care of,
now equivalent of 1,000,000 miles at ~ 60 mph, (1800 RPM<) off grid island
summer camp, circa 1950, (60 + years!) loves Mobil one and Harley
synthetic/Mobil 1 ; much more tolerant of inherent air cooled high temps, better
compression, lower running temp, more electricity, by about 10%, before slowing
down. Stuff shines at high temps. And cold. Used to use 20-50 racing Valvoline
in it, in fall , hard to crank/start, and it burned oil. No more.
I
believe, but more than opinions, there are real reasons
.
John
From: BARJAM300@xxxxxxx [mailto:BARJAM300@xxxxxxx]
Sent: Saturday, August 02, 2014 11:49 AM
To: rixpac@xxxxxxx;
jkg@xxxxxxxxxxxxxxxxx; jymopar@xxxxxxxxxxxxxxx
Cc:
chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Amsoil synthetic gear
lube study
For anyone interested, Amsoil had a third party conduct an
in-depth study on synthetic differential gear lubes. The study can be found at
www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf Please note that
there is an _ (underscore) between "2457_gearlube_study" that does not show up
in the webaddress.
Jim Bartuska
Club Stores
In a
message dated 2014/08/01 05:33:37 P.M. Eastern Daylight Time,
Chrysler300-noreply@xxxxxxxxxxxxxxx writes:
Do not worry about using GL-5
in our differentials. For decades there has been sulphur in gear lube being it
is an anti scuff/anti-weld additive. GL-5 has almost 30% more anti scuff
protection as compared to GL-4. Note; Our transmissions do not use gear oil as
lube. I could understand why the oil would cause shifting problems, being it
would not allow the syncro to clutch quickly and or correctly.
Rick
Post Script; I cannot think of any brass in our 8 3/4 rear axles. I have
had many of these apart for rebuild or repair Re-clutch power lock sure grip and
limited slip 1957 to 1973.
_____
To:
jymopar@xxxxxxxxxxxxxxx
CC: chrysler300@xxxxxxxxxxxxxxx
From:
Chrysler300-noreply@xxxxxxxxxxxxxxx
Date: Wed, 30 Jul 2014 10:45:26
-0400
Subject: [Chrysler300] gear lube
Found out some interesting ,--
could be important ---stuff.
In Auto Restorer; GL-5 gear lube has sulphur
and other additives that attack brass, so not for use on manual transmissions or
rear axles with brass / bronze parts ; GL-4 OK ; I know 300F has brass thrust
bearings in Axle center (Timken style rear wheel bearings) , many cars of our
vintage had brass transmission syncros , brass bushings in diff, etc . I have
been using synthetic 75W Mobil 1, not sure now if GL-5 or 4; GL-5 made for all
100% steel bearings, like ball bearings etc typical of new cars , EP additives
help those, are in GL-5
Heads up!
John Grady, PE
[Non-text
portions of this message have been removed]
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