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It's panto season, so "Oh yes there has" (been a lot of ridiculous =
debate) and "Oh no there isn't" (a large difference in viscosity).
Engine oil and gear oil are measured on different scales. The viscosity =
of SAE80 gear oil is 7cSt, which falls between the viscosity of 20W =
engine oil at 5.6cSt and 25W at 9.3cSt. SAE90 gear oil is 13.5cSt which =
falls between SAE40 engine oil at 12.5cSt and SAE50 at 16.3cSt. Also EP =
90 gear oil was always specified for the V8, and at one time for the =
4-cylinder as well.
PaulH.
----- Original Message -----=20
Are you sure it isn't the gear oil?
The factory has always called for engine oil. There has been a lot of =
ridiculous debate over precisely what grade of engine oil (personally, I =
don=E2=80=99t think it matters, but let=E2=80=99s not start that), but =
there is certainly a large difference in viscosity between say 20W50, =
and 85W90. The overdrive, unlike the rest of the transmission, uses oil =
in a hydraulic function, not just as splash lubrication, so viscosity is =
probably very important.
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<DIV><FONT size=3D2>It's panto season, so "Oh yes there has" (been a lot =
of=20
ridiculous debate) and "Oh no there isn't" (a large difference =
in=20
viscosity).</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Engine oil and gear oil are measured on different=20
scales. The viscosity of SAE80 gear oil is 7cSt, which falls =
between=20
the viscosity of 20W engine oil at 5.6cSt and 25W at 9.3cSt. SAE90 gear =
oil is=20
13.5cSt which falls between SAE40 engine oil at 12.5cSt and SAE50 at=20
16.3cSt. Also EP 90 gear oil was always specified for the V8, and =
at one=20
time for the 4-cylinder as well.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
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style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV><BR></DIV>
<DIV>Are you sure it isn't the gear oil?</DIV>
<DIV><BR></DIV>
<DIV>The factory has always called for engine oil. There has been a =
lot of=20
ridiculous debate over precisely what grade of engine oil (personally, =
I don=E2=80=99t=20
think it matters, but let=E2=80=99s not start that), but there is =
certainly a large=20
difference in viscosity between say 20W50, and 85W90. The overdrive, =
unlike=20
the rest of the transmission, uses oil in a hydraulic function, not =
just as=20
splash lubrication, so viscosity is probably very=20
important.</DIV></BLOCKQUOTE></BODY></HTML>
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