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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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Posts: 13
Joined: September 7th, 2015, 5:47 pm
Vessel Info: 2002 Carver 410 Sports Sedan
Location: Toronto

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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Posts: 2128
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
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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.
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
Past - 1988 2807, 1989 4207 Aft

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Vessel Info: 1989 Carver 3807 Aft Cabin
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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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