Sea foam is good for any outboard motor and you can tell the difference between tanks of gas if you stop using it. 1 ounce per gallon is reccomended by manufacturer, and that is how i mix it for my classic fifty.
what type oil to use on 4stroke 2.5mercury outboard
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
For the 80 hp Mercury, you may use any brand of gear oil that has been blended for use as an outboard motor gear lube. There are many brands available other than oem, and are specially formulated for outboard use.
The serial number OC111736 for a Mercury 15hp outboard motor indicates that it was manufactured in 1981. Mercury outboard motors typically use a coding system where the first letter represents the year of manufacture, and "O" corresponds to 1981 in this case. For precise confirmation, you can also contact a Mercury dealer or refer to an official Mercury outboard serial number guide.
NGK bpr7hs-10
Two things are needed to determine the age of a Mercury outboard, the serial number, and the horsepower rating. The model designation cannot be determined for the Mercury by use of serial number.
Mercury quicksilver premium TC-W 3 or equivilent
The 1995 mercury 25 hp outboard has an approximate weight of 95 pounds. Use care when mounting on a boat already on the lake, as the engine could easily be dropped into the water.
The 5 hp Mercury outboard requires no special type gear oil. General recommendation is for a GL-5 class lubricant, i.e. hypoid 90w. Most any of the oem, or aftermarket gear lubes, manufactured for outboard use, will work just fine.
Mercury outboards prior to 1966 use a 24:1 fuel to oil ratio.
Two things are needed to determine the age of a Mercury outboard, the serial number, and the horsepower rating. The model designation cannot be determined by use of the serial number.
Need to know if its 2 or 4 cycle.