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Doug Meredith
 
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Default Oil weight for mercruiser 5.7

either use Mercruiser 20-40, or straight 40w. See your owners manual for
what Merc recommends. 10-30 is too light for your engine.


"Matt" wrote in message
...
I am changing the oil in my 5.7 v8 Mercruiser. I live in northern New
Jersey and use only in summer months. I was planning on useing 10-30

anyone
recommend anything else?