Yamaha Outboard Oil Systems. Spending time on the water in your small boat, be it on a freshwater lake or through tidewater marshes that experience an influx of saltwater at high tide, starts with making sure your small boat is well prepared and your outboard motor is well maintained. Boat Oil Tanks, Fittings and Accessories. Is it time to replace your boat's oil tank? You're in luck! Great Lakes Skipper's massive inventory of discount new and replacement boat parts and marine accessories includes boat oil tanks, marine oil reservoirs, oil tank rigging kits, marine oil pumps, and more boat oil tanks and oil tank parts from manufacturers like Lund, Mercury, and Bombardier ...I have a mid 90s Yamaha 70hp precision blend 2 stroke. I was starting it this morning and as soon as I turned the key the alarm buzzer went off. I have had the outboard for 4 years and this has never happened before. I turned it off and tried it again several times. The oil tank is full. It's...Jun 14, 2010 · -Loosen the cap on the ENGINE MOUNTED oil tank (approximately 1-1/2 turns). Allow the engine to continue idling, and watch carefully for the oil level to rise. This is a "pressure fed" system, so oil is being "pushed in" as air is being "released" through the cap. This may take only seconds, or as long as a couple minutes.