I purchased a 2018 Ford Focus and have drove nearly 8,000. It's over 7,500 for sure. The oil light hasn't turned on even once. I know these newer cars can go a lot longer between oil changes but I'm worried about going to long. Could the oil light be defected or is the oil still good?
Oil change intervals are much longer now than they used to be, 8000 miles doesn't sound too long. The Ford owners portal says the oil should be changed every 10,000 miles in your case, but put your details in to be sure.
The oil light only goes on if the oil gets very low, or has low pressure, but that doesn't mean you shouldn't check it. When you get home stop the car, then check the oil using the dipstick, the procedure should be pull it, wipe it, put it all the back in, then pull it out and check the level. If it's low top it up with the right kind of oil, don't just use anything. If the level is very low and the sensor hasn't come on then it should be checked.
The answer is yes, the oil light could be defective, but either way I would have changed the oil by now. It's possible it'll go on around 10,000 but I'd go ahead and change it now anyway.
You folks are confused The oil light on the dashboard is not the same thing as the oil change indicator from the computer The engine has a sensor that evaluates oil condition independent from the mileage and signals when oil is approaching end of useful life maybe 8000 or more miles depending on vehicle use and driving habits The oil light only monitors level and pressure of the oil system it has nothing to do with oil life or change intervals