Hartley, Murphy, Mad Mike and more to compete in Superstock Charity Invitational

A host of New Zealand motorsport stars are set to go head to head at this weekend’s Valvoline Superstock Charity Invitational at Paradise Valley Speedway in Rotorua. Drivers like three-time 24 Hours of Le Mans winner Brendon Hartley, four-time Bathurst 1000 winner Greg Murphy, and world renown drifter Mad Mike Whiddett will each take part …