It means that it is electric start (e), extra long shaft (xl), power trim (pt), oil injected (o).
all mercury outboards mix 50:1
The "OC" model 75 hp Mercury outboards were manufactured in 1990.
Only the 3 cylinder models from 1987 and up
The older model mercury outboards, with maker points, should have a 0.020" gap setting.
The "OC" model 75 hp Mercury outboards were manufactured in 1990.
Mercury outboards prior to 1966 use a 24:1 fuel to oil ratio.
Mercury Marine uses both the serial number, and the horsepower rating, to determine the year model of their outboards.
The serial number and horsepower rating for the engine is compared to the Mercury outboard model year chart.
Mercury outboards are best. Johnson Sea Striker series is good too.
The 100 hp Mercury/Mariner outboards use an NGK BP8H-N-10 gapped to .040 in.
In addition to the serial number, which is listed here, the horsepower of the engine is needed, to determine the year model of Mercury outboards.
A 9.8 hp Mercury outboard, serial number 5123082, would be a 1978 year model.