My dog may have drank some water from outside that had a little car oil in it, Now he will not eat or drink, what can I do for him to help him eat and drink?

If you suspect he was poisoned by car oil than get him to the vet ASAP! How long has he not been eating or drinking? This could kill him or at the very least make him very sick. Will he eat anything? You could even try calling poison control, I have no idea if they can help, but if I were in your shoes, I would be trying every thing I could to help him!

I agree Call your vet NOW. If they don't answer calls on the weekend call another one.