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    Yanmar Correct oil?

    I recently purchased a 32ft yacht with a Yanmar 3YM20 diesel engine. I when to to local Yanmar agent for the correct lub oil and received 'Yanmar Genuine engine Oil 15W40' API: CG-4, CH-4'. The engine manual however says "DO NOT use AP1: CG-4,CH-4" but does list 15W40 oil. I'm a bit concerned...
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