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Oil Type

GAS engine, transmission and generator repair and maintenance discussion forum.
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Topic author Canada
Terra Nova
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Vessel Info: 2002 Carver 410 Sports Sedan
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Oil Type

Postby Terra Nova » November 4th, 2015, 10:23 am

I have twin 5.7 litre merc cruiser engines. Thunderbolt ignition. I bought the boat used and the former owner who had it for 18 years has always used 30W non-detergent oil on the engines. Mechanic recommendations are 25W40. Does anybody know if there would be any issues with switching to the 25W40 oil now?
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waybomb
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Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
1996 Boston Whaler Rage 15
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Re: Oil Type

Postby waybomb » November 4th, 2015, 12:05 pm

Ask Mercury in Fon du Lac on current thinking on weight.
That's your very best answer.
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Fred
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
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Canada
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Re: Oil Type

Postby Viper » November 4th, 2015, 8:18 pm

Go with Merc 25W40. No problem with switching over.
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