Depends on how deep you want to go, but you could set up a table with common considerations and let users set frequency... Most maintenance is mileage-dependen

Depends on how deep you want to go, but you could set up a table with common considerations and let users set frequency... Most maintenance is mileage-dependent, so if you base your schedule on their monthly mileage, it could look like: Repair Cost Frequency ------ ---- --------- Oil Change $30 5000 mi Tires $500 45000 mi Battery $150 30000 mi Timing Belt $1500 60000 mi Misc $200 15000 mi Do the math in impact/year and input that cost into your table...