Change your car oil every 3,000 miles. After driving for a certain amount of time, oil becomes dirty and sluggish. Keeping the oil changed regularly reduces dirt circulating in the engine. Another troublesome issue is the belts. With every oil change, you should have the fan belts and air hoses checked for wear and tear.Antifreeze should be changed every year. Have a professional flush out the cooling system and replace the tanks with new coolant. This can keep a radiator from developing leaks. Transmission fluid should be checked regularly. The fluid should be changed every 36,000 miles. If the head gasket leaks, your coolant will leak into the oil system. This is an extremely costly repair, so have them checked regularly to prevent this issue. Always stop first before shifting into drive.