From:John Fairgrieve e-mail:indianjohn15090-A-yahoo.com
Subject:RE: RE: RE: Old Oil Cans - Harley viscosity numbers Date:Sun Dec 1 23:58:24 2013
Response to:18994
I have a 1970 to 1978 Harley Sportster service manual and it states:

Special Light 58 use below 40 degrees

Medium heavy 75 use above 40 degrees

Regular heavy 105 use in severe operating conditions at high air temperatures above 90 degrees

I also have a Clymer 1959 to 1981 Harley Sportster service manual and it states:

Special Light SAE 30 use below 40 degrees

Medium Heavy SAE 40 use above 40 degrees


Regular Heavy SAE 60 use above 90 degrees

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Robbie,

http://s646.photobucket.com/user/Rubone/media/DCP_3262_zps7d080e3b.jpg.html

That's what I was looking for - proof that

"75" Medium Heavy = SAE 40
"105" Regular Heavy = SAE 60

We're still not sure of "58", but it probably is SAE 20. Of course, few of us are riding anything when the temperature is below freezing, so it really doesn't matter much.

"58" Special Light = SAE 20

For the transmission, the Lightweight Service Manual says to use "75" Medium Heavy (SAE 40) when the temperatures are 32 degreesF and above.


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Some cans say both. H-D never used a 70W oil.
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http://s646.photobucket.com/user/Rubone/media/DCP_3262_zps7d080e3b.jpg.html