Subject: [WPTA] Gearbox oils, for your Sunday reading pleasure

From: EDWARD WOODS via Wpta <[email-masked]>
Date: Sun, 6 Aug 2023 08:50:49 -0400 (EDT)

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   For all of you still using engine oil in your Triumph or MG gearboxes:
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tica,arial,sans-serif; color: #333333;">
   And, by the way, when=E2=80=99s the last time it=E2=80=99s been changed?=
 =E2=80=9CDirt is the enemy of all machinery=E2=80=9D
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   &nbsp;
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   Ed Woods
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   &nbsp;
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   &nbsp;
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tica,arial,sans-serif; color: #333333;">
   People confuse engine oil weights with gear oil weights. They have &gt; =
nothing to do with each other. A 75w gear oil has about the same viscosity =
&gt; {pourability} as 20w engine oil. Back in the days when your cars were =
new oil technology expecially gear oil was rather crude. 30w engine oil was=
&nbsp; used because they did not have a gear oil that was thin enough. Ligh=
t&nbsp; weight gear oils are fairly new. The last 15 years or so. Gear oils=
 are designed for shear stregnth. Meaning they cling to virtical surfaces. =
Engine oil does not. By using straight weight engine oils you are using anc=
ient technology. It would be the same as putting on rayon/nylon tires, usin=
g poor fuel etc. We use 75w/80 gear oil in all but our racing boxes. These =
use a 75w synthetic oil. One of the boxes, a pre-war jag box had over 30,00=
0 miles of rallies on it before it broke a gear tooth. There was no evidenc=
e of abnormal brass wear on the syncros. I have never had an oil engineer i=
n 25+ years of business tell me that hypoid oil attacks brass. The light we=
ight gear oils shift better and protect your gears better than any engine o=
il.=20
   <br>Ralph Steinberg
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From: Tint And Blinds via Wpta <[email-masked]>
Date: Sun, 6 Aug 2023 21:01:43 -0400

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">I use red line 75-90. In my four-speed race=
 car gearbox. No problems.<div>Cheers&nbsp;<br><br><div dir=3D"ltr">Sent fro=
m my iPhone via talk to text. I apologize for poor grammar or spelling.&nbsp=
;<div><br></div></div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Aug 6=
, 2023, at 20:42, John Styduhar via Wpta &lt;[email-masked]&gt; wrote:<=
br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF=
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">I us=
e redline MT90 GL-4 in my gearbox and diff.</div></div><br><div class=3D"gma=
il_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Aug 6, 2023 at 10:42=
=E2=80=AFAM JIM UNDERWOOD via Wpta &lt;<a href=3D"mailto:[email-masked]=
">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex"><u></u>

 =20
  =20
=20
 <div>
  <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color:=
rgb(51,51,51)">
   <span style=3D"font-family:helvetica;font-size:12pt">I found that in my M=
GB, the OD would slip on a high RPM shift with gear oil.&nbsp; Switched to A=
TF and the issue was gone.&nbsp; I don't know how many times I had the engin=
e in and out thinking it was the clutch hanging up.&nbsp; Ran into the same i=
ssue on a friends 79B with OD.&nbsp; The TR8 gets GM syncromesh fluid which i=
s a light viscosity.&nbsp; ATF works as well and many use that.&nbsp; Put Ge=
ar oil in a Rover 5spd and you will be grinding gears until it gets hot.&nbs=
p;&nbsp;</span>
  </div>=20
  <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color:=
rgb(51,51,51)">
   <span style=3D"font-family:helvetica;font-size:12pt">Jim</span>
  </div>=20
  <blockquote type=3D"cite">=20
   <div>
    On 08/06/2023 8:50 AM EDT EDWARD WOODS via Wpta &lt;<a href=3D"mailto:wp=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt; wrote:
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
    For all of you still using engine oil in your Triumph or MG gearboxes:
   </div>=20
   <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
    And, by the way, when=E2=80=99s the last time it=E2=80=99s been changed?=
 =E2=80=9CDirt is the enemy of all machinery=E2=80=9D
   </div>=20
   <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
    &nbsp;
   </div>=20
   <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
    Ed Woods
   </div>=20
   <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
    &nbsp;
   </div>=20
   <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
    &nbsp;
   </div>=20
   <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
    People confuse engine oil weights with gear oil weights. They have &gt; n=
othing to do with each other. A 75w gear oil has about the same viscosity &g=
t; {pourability} as 20w engine oil. Back in the days when your cars were new=
 oil technology expecially gear oil was rather crude. 30w engine oil was&nbs=
p; used because they did not have a gear oil that was thin enough. Light&nbs=
p; weight gear oils are fairly new. The last 15 years or so. Gear oils are d=
esigned for shear stregnth. Meaning they cling to virtical surfaces. Engine o=
il does not. By using straight weight engine oils you are using ancient tech=
nology. It would be the same as putting on rayon/nylon tires, using poor fue=
l etc. We use 75w/80 gear oil in all but our racing boxes. These use a 75w s=
ynthetic oil. One of the boxes, a pre-war jag box had over 30,000 miles of r=
allies on it before it broke a gear tooth. There was no evidence of abnormal=
 brass wear on the syncros. I have never had an oil engineer in 25+ years of=
 business tell me that hypoid oil attacks brass. The light weight gear oils s=
hift better and protect your gears better than any engine oil.=20
    <br>Ralph Steinberg
   </div>=20
  </blockquote>
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