Subject: [TR] Should I put Redline MT-90 in my Triumph diff?

From: Sujit Roy <[email-masked]>
Date: Fri, 29 Jan 2021 09:17:57 -0800

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Anything against putting this stuff in my diff. I have in  my manual
gearbox in my Stag

Sujit

-- 
Sujit Roy
Cupertino, California

https://triumphstagblog.wordpress.com/

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<div dir=3D"ltr">Anything=C2=A0against=C2=A0putting this stuff in my=C2=A0d=
iff. I have in=C2=A0 my manual gearbox in my Stag<div><br></div><div>Sujit<=
br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr" class=3D"gmail_sign=
ature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div>Sujit Roy<b=
r>Cupertino, California</div><div><br><a href=3D"https://triumphstagblog.wo=
rdpress.com/" target=3D"_blank">https://triumphstagblog.wordpress.com/</a><=
br><br></div></div></div></div></div>

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Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

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From: Dave MacKay <[email-masked]>
Date: Fri, 29 Jan 2021 14:42:03 -0500

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gearbox in my Stag

I looked into this when trying to find an appropriate fluif for my TR3A=E2=
=80=99s
differential. I don=E2=80=99t know how relevant this would be to your Stag,=
 but
I=E2=80=99ll offer it up anyway.

The contributors to his list showed a preference for:

- Redline GL-5 75W90, or

- Royal Purple Synchromax 75W90, or

- Kendall Gear Oil, 75W

With that in mine, I contacted Red Line Oil, the makers of MT90. They
replied that =E2=80=9CThe TR3A differential originally called for an SAE 90=
 GL-4
and the MT-90 would be recommended=E2=80=9D. When I asked about the caution=
 on
their web site that =E2=80=9CMT-90 are not for use in differentials with hy=
poid
gears=E2=80=9D, Red Line responded that =E2=80=9CThe note on our GL-4 gear =
oils refers to
use in a high offset hypoid application which your Triumph doesn=E2=80=99t =
contain.
The GL-4 gear oils are suitable in zero and low offset ring and pinion
applications.=E2=80=9D

The late (and much missed) Randall Young advised that =E2=80=9CMT90 has fri=
ction
additives=E2=80=9D and felt that one would want friction in a transmission =
but not
in a differential.

When I asked Red Line about the friction additives, they replied that =E2=
=80=9CIf
you wanted a more slippery product one of our GL-5 gear oils such as the
75W90 or 75W110 would be options, they contain a friction modifier and are
compatible with phosphor-bronze as they contain a copper deactivator=E2=80=
=9D. Red
Line summed up by saying =E2=80=9CIn your differential technically either c=
ould be
used, the 75W90 contains a friction modifier beneficial overall for
friction and temperature reduction.=E2=80=9D

As a result of that investigation, I=E2=80=99m using Redline GL-5 75W90 in =
my
TR3A=E2=80=99s differential. I use the MT90 in the gearbox. I=E2=80=99ve ha=
d no issues and
noticed no ill effects when I examined the diff during a rebuild last year.

However, the Red Line oils are hard to come by where I live, and are quite
expensive (about $25/litre). Some of the other TR3 owners locally have been
using Sta-Lube GL4 85W90 Gear Oil which is about half the price of the Red
Line products and is readily available from NAPA.

Regards,

Dave MacKay

1960 Triumph TR3A, s/n 68639L

near Toronto, Canada

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--></style></head><body lang=3D"EN-CA" link=3D"#0563C1" vlink=3D"#954F72" s=
tyle=3D"word-wrap:break-word"><div class=3D"WordSection1"><p class=3D"MsoNo=
rmal">On Fri, 29 Jan 2021 Sujit Roy <a href=3D"mailto:[email-masked]=
">[email-masked]</a> asked:</p><p class=3D"MsoNormal">=C2=A0</p><p c=
lass=3D"MsoNormal">&gt;Anything against putting this stuff in my diff. I ha=
ve in=C2=A0 my manual gearbox in my Stag</p><p class=3D"MsoNormal">=C2=A0</=
p><p class=3D"MsoNormal">I looked into this when trying to find an appropri=
ate fluif for my TR3A=E2=80=99s differential. I don=E2=80=99t know how rele=
vant this would be to your Stag, but I=E2=80=99ll offer it up anyway.</p><p=
 class=3D"MsoNormal">=C2=A0</p><p class=3D"MsoNormal">The contributors to h=
is list showed a preference for: </p><p class=3D"MsoNormal">- Redline GL-5 =
75W90, or</p><p class=3D"MsoNormal">- Royal Purple Synchromax 75W90, or</p>=
<p class=3D"MsoNormal">- Kendall Gear Oil, 75W</p><p class=3D"MsoNormal">=
=C2=A0</p><p class=3D"MsoNormal">With that in mine, I contacted Red Line Oi=
l, the makers of MT90. They replied that =E2=80=9CThe TR3A differential ori=
ginally called for an SAE 90 GL-4 and the MT-90 would be recommended=E2=80=
=9D. When I asked about the caution on their web site that =E2=80=9CMT-90 a=
re not for use in differentials with hypoid gears=E2=80=9D, Red Line respon=
ded that =E2=80=9CThe note on our GL-4 gear oils refers to use in a high of=
fset hypoid application which your Triumph doesn=E2=80=99t contain. The GL-=
4 gear oils are suitable in zero and low offset ring and pinion application=
s.=E2=80=9D </p><p class=3D"MsoNormal">=C2=A0</p><p class=3D"MsoNormal">The=
 late (and much missed) Randall Young advised that =E2=80=9CMT90 has fricti=
on additives=E2=80=9D and felt that one would want friction in a transmissi=
on but not in a differential.</p><p class=3D"MsoNormal">=C2=A0</p><p class=
=3D"MsoNormal">When I asked Red Line about the friction additives, they rep=
lied that =E2=80=9CIf you wanted a more slippery product one of our GL-5 ge=
ar oils such as the 75W90 or 75W110 would be options, they contain a fricti=
on modifier and are compatible with phosphor-bronze as they contain a coppe=
r deactivator=E2=80=9D. Red Line summed up by saying =E2=80=9CIn your diffe=
rential technically either could be used, the 75W90 contains a friction mod=
ifier beneficial overall for friction and temperature reduction.=E2=80=9D</=
p><p class=3D"MsoNormal">=C2=A0</p><p class=3D"MsoNormal">As a result of th=
at investigation, I=E2=80=99m using Redline GL-5 75W90 in my TR3A=E2=80=99s=
 differential. I use the MT90 in the gearbox. I=E2=80=99ve had no issues an=
d noticed no ill effects when I examined the diff during a rebuild last yea=
r.</p><p class=3D"MsoNormal">=C2=A0</p><p class=3D"MsoNormal">However, the =
Red Line oils are hard to come by where I live, and are quite expensive (ab=
out $25/litre). Some of the other TR3 owners locally have been using Sta-Lu=
be GL4 85W90 Gear Oil which is about half the price of the Red Line product=
s and is readily available from NAPA.</p><p class=3D"MsoNormal"><span lang=
=3D"EN-US" style=3D"font-family:&quot;Verdana&quot;,sans-serif;color:#2f549=
6">=C2=A0</span></p><p class=3D"MsoNormal">Regards,</p><p class=3D"MsoNorma=
l">=C2=A0</p><p class=3D"MsoNormal">Dave MacKay</p><p class=3D"MsoNormal">1=
960 Triumph TR3A, s/n 68639L</p><p class=3D"MsoNormal">near Toronto, Canada=
</p></div></body></html>

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From: Rochlin Robert <[email-masked]>
Date: Fri, 29 Jan 2021 15:37:09 -0500

I use 30 non detergent oil in my transmission.  When I had Quantum Mechanics rebuild my transmission years ago John Esposito recommended that I run 30 ND oil. At some point I used Redline Oil fro a couple of years and it worked well, but the only difference I could really notice between the Redline and 30 ND was that in cold weather the redline shifted more easily when cold, but during the summer and in the fall when the car warmed up both worked equally well.  The advantage of to 30 Wt. is that I can change it as part of winter maintenance for about $10.00, assuring that any metal wear bits are cleaned out.  I’ve been running Mobil synthetic 90 wt. in the differential.  
	Best,
	Bob
	'72 TR6
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