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Yanmar Correct oil?

MY ORION

New member
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 about using oil which is not recommended by the manual. Can anyone recommend lub oil for a 3YM20?
 
It's non turbo. However when i speak to the boatyard that serviced the Yanmar 3YM20 lasted they used 15W40 turbo oil on the last service. This just adds to the confusion!

Liam
 
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