Dealer says I CANNOT put 0W40 oil in my 2017 or Voids Warranty???
Is this true? I understood that all C7 could used the improved 0w40 on street or track? When I first came in the Service Advisor did not know anything about 0W40? This is Quality Chevrolet in Escondido,California; sells quite a few Corvettes?? Anyone else had this comment??