I work for a university where students are often approved for a Sallie Mae loan, but usually only for a small amount (less than $2,000). When the amount gets higher, then factors like income and the length of your credit history will matter more.
Getting Started. Fouled, damaged, or worn out spark plugs can lead to a variety of engine problems, such as misfires, hard starts, increased emissions, and poor fuel economy. For most vehicles, you should replace your spark plugs every 30,000 miles (consult your owner's manual for your specific interval). It is also recommended that you replace your spark plugs wires at the same time, or you may still experience misfires or other problems.
Detailed Topics. When Do Spark Plugs Need To Be Replaced. Spark plugs come in an abundance of designs. Many claims used in selling spark plugs are vastly overstated or false. Very sound reasons also exist, why spark plugs should be replaced. Many reasons for replacement are not common knowledge.