Vehicle Maintenance Schedule Generator

Engine oil service intervals depend on oil formulation: Conventional oil requires changes every 3,000 to 5,000 miles (3–6 months), synthetic blend every 5,000 to 7,500 miles, and full synthetic oil lasts 7,500 to 10,000 miles (or 12 months). Severe driving conditions (stop-and-go city traffic, extreme heat/cold, or towing) shorten intervals by 25%.

Copper spark plugs require replacement every 30,000 miles. Platinum spark plugs last roughly 60,000 miles, while modern iridium spark plugs extend to 90,000 to 120,000 miles before electrode wear causes engine misfires (P0300) or poor fuel economy.

Automatic transmission fluid (ATF) and CVT fluid should be serviced every 30,000 to 60,000 miles. Manual transmission gear oil usually lasts 45,000 to 60,000 miles. Changing transmission fluid prevents clutch slip, erratic shifting, and expensive overhauls.

Timing belts should be replaced every 60,000 to 100,000 miles or 7 years. Unlike serpentine belts, timing belts operate internally. Failure on interference engines causes catastrophic piston-to-valve collisions.