My honda civic does need an oil change, about 4,000 since last one, but past two days has been starting slightly rough and when change to park and reverse sounds rougher. Is this an air filter, oil, or transmission fluid thing? I just drove about 1.200 miles in one go, so I wouldn't be surprised if an oil change would fix it. Also noticed a bit of corrosion on battery terminals, how important is that?
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