my kenari is facing (i think) engine oil decrease, it is full when cold morning before start the car, and after engine running optimum temp, i shut the car off immediately and remeasure the oil level, the oil level goes down to half, is this normal?(ps. all measurement done at leveled floor) i heard some mechs said that is normal, and kenari engine oil must be measured right after car engine turned off is the most accurate, if low oil level reading resulted from that means engine oil is low and need refilling. I tried refilling engine oil at hot temp, resulted with over the full mark level at morning. while some said that engine oil level is best checked at morning before any startup. Which is true? i kind a worry bout these things, the car current milage is 300,000 km and counting.(with occasionally touge race) i don wan during race i suffer low engine oil starvation. and i want to try avoid overhaul the engine. Currently i switch engine oil from petronas 5w30 semi to mineral 15w40 nasa oil, as the petronas ones evaporates faster than i imagined, 1500 km has lost to half tank. now with nasa oil the engine oil level still not less yet. so what is your oppinion? how to measure engine oil level? anything that i should be worried? Thx a lot!