I took my 3-yr Nissan in for an oil change and mentioned I was going on a long trip and to also check the fluids and rotate tires. Well, they did check it over and found the battery was not performing well, so they asked if I wanted them to replace it. I said yes, and I'm glad they did after looking at the old battery. The posts were corroded and the battery itself was swollen, indicating it wouldn't have lasted long. It definitely would gave presented a problem on our long trip. So, kudos to them for being so thorough. I appreciate it very much.