I did my first oil change myself (previous ones were done by dealer/not me) so this was my first time under the car and noticed some rust on the undercarriage. I am from PA so obviously there was going to be some rust with the salt they cake the roads with in the winter time. Mine is a 2017 and has seen two winters here. Is this normal/expected or is this something I should be worried about? Sorry about the somewhat crap/out of focus pics.