HOW TO CHANGE GEAR-CASE LUBE
Master this task and do it at least once a year.
Every 100 hours, or at least once per year, you need to drain and refill the gear-case lubricant, aka lower unit. Between changes you can quickly pull and eyeball the magnetized drain plug, looking for water and substantial metal shavings. If you discover either of these, you should replace the lube — then see a dealer for service. —John Tiger
THE RIGHT STUFF Check with your engine manual for the correct type and quantity of lubricant for your engine. There are different specs and weights for gear-case lubricants.
GO WITH FLOW Run the engine for a few minutes on a flusher to warm up the lube, particularly if it is cold
outside. A heat gun, hair dryer or halogen work lamp applied judiciously will also warm up the lube quickly so it will flow well.
NEAT AND TIDY Make sure the drain pan is positioned under the lower drain screw so lubricant won’t splash out onto the ground. A makeshift