Mercury 200 (20 hp) outboard oil/gas premix

[clevek]

Just purchased Mercury 200 (20 hp) outboard on a 1957 cadillac aluminum boat, would like to know what Mercury recommends for the oil/gas premix ratio and oil (obviously this is an older engine and the oils and gas have changed considerably)...the previous owner did not have owners manual and was using brand x from wally world, please advise

 

[irishviking]

Re: Mercury 200 (20 hp) outboard oil/gas premix

in my opinion I would use mercury Quicksilver oil for your motor it made by mercury for mercury. If you can't get that i would use pennzoil 2 cycle. both i would mix at 25 to 1 maybe a little heavier since it is an older motor.<br /><br />this is my opinion and will not beheld responsible for anything! Good luck

 

[JB]

Re: Mercury 200 (20 hp) outboard oil/gas premix

Hi, Clevek.<br /><br />Quicksilver is blended and bottled for Mercury by a major oil company, not "made by Mercury".<br /><br />The Wal Mart Supertech is blended and bottled for Walmart by Pennzoil.<br /><br />Either will do just fine in your older Merc.<br /><br />24:1, 87 octane unleaded regular and ANY NMMA certified TCW-3 outboard oil would be a safe mix.<br /><br />If your engine is "fully jeweled" with needle and other non-friction bearings a 50:1 mix would be even better. Someone will be along soon who knows if your engine is fully jeweled.<br /><br />You need to tell us the model number of your engine to establish the year before that can be done.<br /><br />Good luck.

 

[clevek]

Re: Mercury 200 (20 hp) outboard oil/gas premix

Thanks for all your advice.<br /> My outboard is an 1971 mercury<br /> model 200 (20 hp) <br /> engine s/n# 3138183<br /> Seems to be just running fine on<br /> 50:1 pre mix but don't have an owners manual yet and that is why i posted asking for advice...thanx again