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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=774373915-19062015>The content of E(xtreme)P(ressure) additives is
designated by the GL specification and GL4 is stong enough for gearboxes,
but normally not for hypoid rear axle gears. GL5 is necessary ,
especially in racing. Synthetic gear oil is much better in resisting to the
shear forces (sliding action) of hypoid gears. </SPAN></FONT></DIV>
<DIV lang=nl class=OutlookMessageHeader dir=ltr align=left><SPAN
class=774373915-19062015><FONT color=#0000ff size=2
face=Arial>High viscosity is only necessary for the oil to stick onto the
gears. At least this is what I've heard and it seems to make
sense.</FONT></SPAN></DIV>
<DIV lang=nl class=OutlookMessageHeader dir=ltr align=left><SPAN
class=774373915-19062015><FONT color=#0000ff size=2
face=Arial>Marcel</FONT></SPAN></DIV>
<DIV lang=nl class=OutlookMessageHeader dir=ltr align=left>
<HR tabIndex=-1>
</DIV>
<DIV lang=nl class=OutlookMessageHeader dir=ltr align=left><FONT size=2
face=Tahoma><B>Van:</B> Fot [mailto:fot-bounces@autox.team.net] <B>Namens
</B>Greg And Alison Blake<BR><B>Verzonden:</B> vrijdag 19 juni 2015
4:22<BR><B>Aan:</B> Bud R<BR><B>CC:</B> FOT<BR><B>Onderwerp:</B> Re: [Fot]
Differential gear oil?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>I use the Costal GL4 from NAPA and change it every 2 race weekends in the
TR3. This is a welded diff so not as much heat as an open diff or one of those
fancy limited slips. Works great and about $30/gal. </DIV>
<DIV><BR></DIV>
<DIV>I tried using this in the WRL endurance TR6 last month. In hour 6, we
boiled the fluid right out of the diff and melted the poly mounts. This was a
stock open diff. Most of the endurance racers I spoke to said that they use full
synthetic in their endurance diffs due to the prolonged heat. </DIV>
<DIV><BR></DIV>
<DIV>I will continue using Costal in the 3, but will only use full synthetic
from now on for endurance events. We lost about 3 of seat time due to that
failure. Well worth the extra cost of synthetic. Not to mention all those
bearings and damn side seals that have to be replaced now. What a pain.
</DIV>
<DIV><BR></DIV>
<DIV>Greg</DIV>
<DIV><BR></DIV>
<DIV><BR><BR><BR></DIV>
<DIV><BR>On Jun 18, 2015, at 1:08 PM, Bud R <<A
href="mailto:levilevi@comcast.net">levilevi@comcast.net</A>>
wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV>So Redline shock proof “light” gear oil is what I’m leaning to use in the
refurbished diff I’m putting in the race car.
<DIV><BR></DIV>
<DIV>What do others use?</DIV>
<DIV><BR></DIV>
<DIV>Thanks
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