My grandfather used to change the filter every 3,000 and the oil every 6000. He did it to a 1979 chevy station wagon with a 350. He sold the car to my dad. My dad drove it until the odometer had 500,000 miles on it. then the odometer stopped working and he drove it for another 5 years. He sold it to a scrap yard in 1995 because the body rusted out beyond repair.