Yamaha Oil Pan Set 99999-03923-00. Overview. The Yamaha Oil Pan Set 99999-03923-00 is a genuine original equipment manufacturer assembly designed to support proper oil containment and engine lubrication. This component plays a critical role in collecting and storing engine oil, allowing it to circulate efficiently throughout the engine to reduce friction, dissipate heat, and prevent premature wear.. Over time, oil pans can become damaged due to corrosion, impact, or prolonged use, which may lead