To read the engine oil dipstick
I was told by my mechanics to read the dip stick 3 minutes after the engine is off. However, I found that this is no longer correct with today's engine oil. The oil we use today are design to cling on to the engine part so well that 3 minutes is not enough for them to drain down back to the pan and therefore the dipstick reading is incorrecct. I think we should leave the car overnight to have it checked.