Hey Scotty, im considering buying a 1990 Corvette ZR1. It was owned by a car collector and mostly sat in storage so it only has 11,000 miles. The manual recommends 10w-30 conventional. But this was written 28 years ago, so I was wondering if i should run a synthetic blend or if I should just follow the manual and run 10w-30 conventional? Or maybe some other oil?