2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 143Get this manual
4-8 ENGINE LUBRICATION SYSTEM Engine Oil and Oil Filter WARNING
Watercraft operation with insufficient, deteriorated, or contaminated engine oil will cause accelerated wear and may result in engine seizure, accident, and injury
Oil Leve Inspe ction
This watercraft engine is equipped with semi-dry sumpIn the semi-dry sump engine, the oil level difference is very large between the level measured after just stopping and that after leaving for long timeIt is necessary to check the specified amount of oil is in the engine before starting the engine every dayAt this time use the cold mark of the level gaugeThen run the engine to lubricate the engine parts sufficientlyAfter that it is necessary to check the level by using hot mark of the level gauge