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you need a minimum of 87 octane gas
well considering the engine type petrol diesel the best outboard motor to get would be a petrol engine as this is easy fuel to come across just don't get any water in the fuel tank as this will cause the engine to cease and that's bad so get a petrol engined outboard motor and petrol hope this helps
The 1976 model, 115 hp Mercury outboard, requires a 50:1 fuel to 2 cycle oil ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel. The use of 4 stroke type motor oil is not recommended, nor intended, for fuel / oil mix.
what type oil to use on 4stroke 2.5mercury outboard
The recommended spark plug for a 1992 model, 200hp Mercury 2 stroke carbureted outboard, is an NGK BU8H. This is a perma-gap type plug, so no gap setting is required.
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
The recommended spark plug for the 1977 model, 7.5 hp Mercury outboard is a Champion L78V, or NGK BUHW-2. Both brands are Perma Gap type plugs, with the Champion being the manufacturer supplied plug back in 1977.
5w-30
The Mercury outboard 4.5 with serial number 4273176 was created in two type mode which are the "M" and "ML" model. Both model types were manufactured in 1975.
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Mercury 1984 6 cylinder L6 what type & size of starting battery is required