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Mercury Marine recommends valve additive

elgineddie

Contributing Member
"Hey team,
I've read Merc


"Hey team,
I've read Mercury recommends an "automotive grade valve lubricant additive" for my engine (1998 305ci). I've never added such an additive and I can bet the previous owners haven't either.

What would a valve lubricant additive actually be? Lucas' fuel conditioner? SeaFoam?

Thanks in advance,
Ed"
 
Sounds like they are talking a

Sounds like they are talking about a lead substitute although your engine should be well beyond the era when it was needed. Marvel Mystery Oil is a respected automotive fuel additive that people opperating in an ocean enviorment like to use to help reduce corrosion in the fuel system. If you use Marvel Mystery Oil do not exceeed the recommended ratio of additive to fuel
 
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