Oil Type
- Terra Nova
- Scurvy Dog

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Oil Type
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?
- waybomb
- CYO Moderator

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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 - Location: Saint Joseph,Mi
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Re: Oil Type
Ask Mercury in Fon du Lac on current thinking on weight.
That's your very best answer.
That's your very best answer.
Thanks
Fred
1969 Glaspar Avalon /1967 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
Fred
1969 Glaspar Avalon /1967 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
-
Viper
- CYO Supporter

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