The manufacturer says single weight, either 20# or 30#. So, if you are
in the Arctic circle, or somewhere so cold that heavier oil affects
shifting or slippage, use straight 20#. Elsewhere, use straight 30#.
https://www.yanmar.com/media/global/com/product/marinepleasure/sailBoatPropulsion/operationmanualgears/outlineKM4A-2.pdf
Bill Bina
On 11/29/2016 4:50 PM, Josh Muckley via CnC-List wrote:
I've not come across this designator "SAE 20/30". I've seen "SAE 30"
and "SAE 20" but never "SAE 20/30". I believe the other listers are
probably correct that it is designating one or the other. Building on
that assumption, if it makes life easier, you can use a multi weight
oil since they are all the same viscosity at operating temperature. A
5w30 or 10w30 will be fine.
http://themotoroilevaluator.com/members-blog/understanding-multi-viscosity-oils/#axzz4RR6Z4Xs2
Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Tue, Nov 29, 2016, 2:53 PM Persuasion37 via CnC-List
<[email protected] <mailto:[email protected]>> wrote:
I would suspect that you would use the right weight based on
operating temperature. Up here in the great white north you
probably would use 20w. As you move south into warmer
temperatures you may want to use 30w. Age could also play a
factor. Am I glad I use ATF😜
Mike
PERSUASION
C&C 37 K/CB
Long Sault
On Nov 29, 2016, at 1:14 PM, Joel Aronson via CnC-List
<[email protected] <mailto:[email protected]>> wrote:
Maek,
It means a single weight oil - either 20w or 30w, not a
multi-weight such as 10w-30.
Joel
On Tue, Nov 29, 2016 at 1:09 PM, Hoyt, Mike via CnC-List
<[email protected] <mailto:[email protected]>> wrote:
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