Tips for Keeping Your Car Running Smooth
The Engine

Oil is essential to your engine. And for most people, changing it every three months or 3,000 miles is the first thing you should do to keep your car in good shape. But sometimes, your oil needs some extra attention. If you tow a trailer, drive in dusty conditions, or frequently drive in stop-and-go traffic, you should change your oil more often. Short trips without letting your engine warm up can contaminate your oil and require more oil changes than average too. So, to keep your car running smooth, make sure you have the following engine-related services done regularly:

Change the oil.
Change the oil filter, air filter and fuel filter.
Check the PCV valve for proper operation.
Check the spark plugs and spark plug wires.
Very Hard - 10.5 and higher gpg.