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Prolong engine treatment

jarrettfordjarrettford Member Posts: 21 ✭
in General Boating Discussions
Anyone ever use this treatment and is it as good as they say..
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    Michael TMichael T Member Posts: 7,227 ✭✭✭✭✭
    edited May 2020
    On Mercruiser engines have always used the synthetic or semi synthetic they recommended along with the recommended Mercruiser high efficiency oil filter designed for the particular oil used. In non Mercruiser "built engines" engines I have used Kendall Racing, Amsoil and Royal Purple.
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