If someone put oil in my radiator and in my power steering, how long before the car would overheat? I had an oil change on 11/19 and no one else has done anything to the car except put gas in the gas tank and washer fluid in the washer fluid reservoir (that was me). The only people that have been under the hood are the people that change my oil. On Christmas night I drove home from work fine and then when I got home it started overheating. My husband opened the hood and had to flush out the radiator bc there was hot oil in it. Then found out there was also oil in my power steering. I lock my car and the only way under the hood is by releasing it inside the car. 2016 Honda Odyssey.