Vehicle manufacturers and mechanics suggest that an oil change is done at least ... A. every two months or 2,000 miles. B. every three months or 3,000 miles. C. every six months of 6,000 miles. Vehicle manufacturers and mechanics suggest that an oil change is done at least ... A. every two months or 2,000 miles . B. every three months or 3,000 miles . C. every six months of 6,000 miles .​