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Should I be running a zinc additive in the oil on my 1987 4.3L mercruiser? I assume it has a flat tappet camshaft. I know that most cam manufacturers recommend a zinc additive for their non roller cams. What do you guys think?

Hey guys, I am new here, but not new to Sea Ray boats. My grandfather special ordered a brand new 21ft sea ray seville in 1987. It is a bowrider with the 205hp 4.3 v6. She only has about 365 hours on her and still looks great for her age. I have a few questions, but i will get around to...