Ever wondered when your last oil change was and needed to check the oil level? Most of us don't have this problem — when we take a car in for an oil change, the mechanic will usually put a sticker on the windshield to let us know when's the next time to come in for a visit. But let's say we don't have a sticker or any kind of maintenance reminder. So we pop open the hood and look for the dipstick. Wait ... where did it go?! Once, dipsticks were the go-to method for checking oil levels and finding...