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Old 08-14-2018, 07:35 PM   #4
High Wire
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City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,964
Are you sure it only recommends SAE 20? My Perkins, Kubota, and Westerbeke manuals recommend SAE 20 OR 10W30. Nothing wrong with 10W30 changed at normal recommended intervals, especially in cold climates.
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Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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