Mark 25 fuel oil mix
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What oil and how much should be used in the gas with a mark 25?
Also what lower unit oil does it take?
Thanks
Jason
Replies: 251
Topics: 33Not sure about the oil mix but I know it’s out there or someone will reply. As for the mark 5, I think it’s uses the bendix coil? If so there’s no such thing as a cheap one. Old outboard Jim sells them for about $60 a pop.
Mercury specified TCWC3 certified oil, mixed 50:1. I use 40:1 in all of my old green and white Mercs, just as a precaution – oil is cheaper than parts and more available. Have used Tech brand from Walmart for years. Use lower unit oil recommended for shift gear boxes.
Mark 5 coils – is that Bendix or Phelon? Old Outboard Jim may have them.
Will these coils work?
http://www.rockauto.com/en/moreinfo.php … 14&jsn=257According to the Old Outboard Handbook, Mercurys from 1956 to 1962 get 6 ounces of oil per gallon, which is 21 to 1, and double that for racing. In 1963 Mercury went up to 50 to 1.
Dave
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