Multi-viscosity oils may not behave properly in a transmission or other
mechanical device that calls for a single weight oil. Gearboxes are not
engines. In most cases, in devices calling for a single weight oil,
there will be other stipulations such as non-detergent, as well. I sure
would not "wing it". Contact someone who knows for certain. That would
likey be the manufacturer, or someone who services the units in question.
http://www4.yanmarhelp.com/
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
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