An illuminated Check Engine Light can be annoying because you don't know what's wrong, and whether or not the problem might be a serious one or just a minor fault. There is no way to know what the problem is until you plug a scan tool into the vehicle's diagnostic connector and read out the code(s) that turned the light on. If no other warning lights are on, and the engine seems to be running normally (no unusual noises, smells, vibrations, etc.), you can assume the fault that is causing the Check Engine Light to come on is probably minor and won't hinder your ability to continue driving. But if other warning lights are on, you should probably stop and investigate the problem.
Regular oil changes are a critical maintenance item in ensuring your car’s engine runs properly and will have a long life. If oil changes aren't done in a timely manner, your car's performance and fuel economy can suffer, and long-term damage can occur. Any oil change should include replacing the oil filter. As engine oil travels throughout the engine, it collects dirt, debris and other particles such as metal shavings from engine wear. During normal engine operation, the oil is pumped throughout the engine and eventually cycles through the oil filter, which collects these particles which could otherwise damage the engine.