Most car manufacturers are now recommending engine oil and filter be replaced every 7,500 miles for normal driving conditions. They paint a rosy picture. The reality is that most cars are not driven under circumstances that would qualify as normal. If you do a lot of stop and go driving, short trips or extended freeway driving, your car would be listed under the “Severe Driving Schedule”. The manufacturer therefore recommends that the engine oil and filter be replaced every 3,000 miles. This is extremely important for turbocharged vehicles.