It depends on the car's make, model and year, as well as driving conditions. Many of today's automakers recommend oil changes at 5,000, 7,000 or even 10,000 miles. Drivers should check the automaker's recommendation by reviewing the car's user manual.

Bonds are rated according to their risk of default by independent credit rating agencies such as Moody's, Standard & Poor's and Fitch. Those with lower ratings have higher risks associated with them that investors should consider. Due to increased risks, these bonds typically carry higher coupon rates. Issuers, such as consumers with less than

Unlike mutual funds, which can be purchased in fractional units, shares of stock cannot be divided. So, the smallest number of shares an investor can buy is one share. There is a catch that could determine for investors just how many sharesthey will want to purchase - commission fees.