Are these oil and slip resistant?

Yes, to the best of my knowledge!

Is this boot wide? If so is it the c/d???

Thank you for your interest in Georgia Boots. This style is available in both medium and wide width. This one, is a wide width which will appear with a "w" or "2e" We hope this helps with your buying decision. Please reach out with further questions. Have a great day! -MB @ Georgia Boots

Can the soles be replaced by a shoe repairman or are they just throwaways if the sole cracks, splits, or wears out?

Thank you for your interest in Georgia Boots. This style, GR500, does have a welted construction. which means you would be able to have it resoled at a shoe repair shop. We hope this helps with your purchase. Please reach out with further questions. Have a great day. -MR at Georgia

How heavy are these boots?

Although I’m uncertain of the exact weight they are not that heavy. I own a pair of Georgia Steel-Toe lwork boots and they are nowhere near that heavy. I could compare them to a pair of Merrell Jungle Mocs.