Car Maintenance FAQs
Car Maintenance FAQ
Common questions and concise answers to help you keep your car safe, reliable, and economical.
How often should I change my engine oil?
Most cars: every 3,000–5,000 miles for conventional oil, or 7,500–10,000 miles for many synthetics. Always check your owner’s manual for the recommended interval.
What’s the difference between synthetic and conventional oil?
Synthetic oil lasts longer and performs better in extreme temperatures, but it’s usually more expensive. Some vehicles don’t require synthetic, so follow the manufacturer’s recommendation.
How often should I replace the oil filter?
Usually with every oil change. Some cars have filters that require replacement at each oil change; check your manual.
How often should I check and top up fluids (oil, coolant, brake fluid, transmission fluid, power steering, washer)?
Check monthly and top up as needed, using the correct fluid type specified in your manual. Do a quick overall fluid health check during each oil change.
How do I know when my tires need to be replaced?
Tread depth of 2/32\" (or wear bars visible) means replace. Also replace if you see bulges, cracks, or cords showing, or if you notice poor traction.
How often should I rotate my tires?
Every 5,000–7,500 miles or per your manual. Rotation helps even wear and extends tire life.
How do I check tire pressure and why is it important?
Check when tires are cold, using the recommended PSI from the door placard or owner’s manual. Proper inflation improves safety, fuel economy, and tire longevity.
What signs indicate brakes need replacing?
Squealing, grinding, longer stopping distances, a soft or spongy pedal, or a vibration when braking. Have pads, rotors, and fluid inspected.
When should brake fluid be replaced?
Brake fluid is usually changed every 2–3 years or per the manual. It can absorb moisture over time, reducing braking performance.
How do I test and maintain the car battery?
Look for clean corrosion-free terminals. A healthy battery typically reads about 12.6V with the engine off; 13.7–14.7V when running. Replace every 3–5 years or as needed.
How do I know if a belt or hose is worn?
Belts: cracks, fraying, glazing, or squeals. Hoses: cracks, bulges, hardness, or soft spots. Replace worn parts promptly.
How often should I replace engine and cabin air filters?
Engine air filter: about every 12,000 miles (or more in dusty environments). Cabin air filter: per manual, or when airflow drops or odors appear.
What should I do if the check engine light comes on?
Don’t ignore it. If it’s steady, it may be a minor issue (gas cap). If it’s flashing, pull over safely and seek help. Use an OBD-II reader or visit a mechanic to read the code.
How do I know if my car needs an alignment?
If the steering wheel is off-center, the car pulls to one side, or you see uneven tire wear, an alignment check is a good idea.
How often should I flush or replace coolant?
Coolant typically lasts several years (check manual). Some cars require a coolant flush at specific intervals; follow the manufacturer’s schedule.
How often should I service the transmission?
Automatic transmissions: follow the manual for fluid level and replacement intervals (many newer cars are “sealed” and only serviced as needed). Manual transmissions: consider regular clutch and fluid checks. Always follow the OEM schedule.
What about wiper blades and lights replacement?
Wiper blades: replace every 6–12 months or when they streak. Lights: replace bulbs as soon as they burn out or dim; check monthly.
What basic tools should I have for DIY maintenance?
Basic toolkit: jack, jack stands, lug wrench, socket set, screwdrivers, pliers, torque wrench, funnel, oil drain pan, rags, gloves, battery cleaner, and a tire pressure gauge.
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