My oil tank is in the garage right next to my scrap pile. The 2.5 MERC's have a plastic 2 piece crank gear that drives the oil injection pump. These gears are very well known to fail if you bring the engine off idle before it's up to temp. The 3.0L MERCS have the same basic system that the YAMAHA's and SUZUKI's had. They were pretty reliable, but the 2.5's were not the best. MERCURY changed the platic gears out sometime around 99-00 for a bronze gear which helped out alot. Which 200 do you have? The 20o was availible in either a 2.5L or 3.0L. IIRC the 200HP BLUEWATER was a 3.0L, the OFFSHORE series was a 2.5L.