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There's some debate that the EP--'Extreme Pressure' sulfur
compounds*--additives used in GL-5 are not suitable for gearboxes with
brass or bronze components. But, at most they may turn these copper
alloys blackish and I've never heard of any issues in Healeys. I've used
MT-90, which is GL-4 with somewhat less EP additives, in both my Healey
gearboxes for years, and when I tore down the BJ8's gearbox the brass
components were pristine. I use Redline 75W-110 GL-5 in the BJ8's diff
with no issues.
Sniff some GL-5 sometime, and see if it doesn't smell a bit of brimstone.
bs
On 8/1/2021 9:24 AM, Michael Oritt via Healeys wrote:
> Tom--
>
> Its base--synthetic or dino--does not matter though I prefer the
> former. However its GL rating DOES matter, and you should be using a
> diff lube with a GL5 rating which will better stand up to the shearing
> forces in the differential. Engine oils or /GL4 transmission oils are
> not sufficient.
>
> On Sun, Aug 1, 2021 at 11:40 AM Tom Felts via Healeys
>
> BJ8-----I'm changing oil inn the diff and had some synthetic
> 75-140. Is that OK to use there?
>
> thanks'tom
>
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There's some debate that the EP--'Extreme Pressure' sulfur
compounds*--additives used in GL-5 are not suitable for gearboxes
with brass or bronze components. But, at most they may turn these
copper alloys blackish and I've never heard of any issues in
Healeys. I've used MT-90, which is GL-4 with somewhat less EP
additives, in both my Healey gearboxes for years, and when I tore
down the BJ8's gearbox the brass components were pristine. I use
Redline 75W-110 GL-5 in the BJ8's diff with no issues.<br>
<br>
Sniff some GL-5 sometime, and see if it doesn't smell a bit of
brimstone.<br>
<br>
bs<br>
<br>
<div class="moz-cite-prefix">On 8/1/2021 9:24 AM, Michael Oritt via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPTa0B59LiyBdn3jaW6kaT0jO-hFWyAwMyoweLxZ2WHONd+-iA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default" style="color:#3333ff">Tom--</div>
<div class="gmail_default" style="color:#3333ff"><br>
</div>
<div class="gmail_default" style="color:#3333ff">Its
base--synthetic or dino--does not matter though I prefer the
former. However its GL rating DOES matter, and you should be
using a diff lube with a GL5 rating which will better stand up
to the shearing forces in the differential. Engine oils or
/GL4 transmission oils are not sufficient.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Aug 1, 2021 at 11:40
AM Tom Felts via Healeys <<a
href="mailto:healeys@autox.team.net";
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div>BJ8-----I'm changing oil inn the diff and had some
synthetic 75-140. Is that OK to use there?</div>
<div><br>
</div>
<div>thanks'tom</div>
</div>
<br>
</blockquote>
</div>
</blockquote>
<br>
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