Wipers cheap Dave compared to what I have just gone through. V6 3.6lt not idling. Took it in and Ecm problem(had repair before) sent off came back same issue(under warranty) bit the bullet got one from Aussie and mapped,all good,plugged in ran fine for 100kms took back rescan,new code showed injector fault,out with injector ,open circuit. New injector holden NZ from Aussie $550 + gst. Mechanic found another supplier with USA GM injector $225. mould enclosed injector. Not common fault as should last lifetime of motor.Yeah so ECM + injector + labour about $1150.00 good for another 300k
Gm placed the ECM on the front of engine ,heats up cools down gets wet,apparently most last only 120,000k got 180k, rebuilt steering rack $1k
Cost of vehicle v repairs still ahead in terms of replacement vehicle