It was so bad in the late 70's early 80s at GM that the factory tech people were afraid to come to the dealerships and spend a great deal of time telling us to read the bulletins... Well, the root word in bulletin is "bull" and that's all we got out those bozos... And got lousy warranty book time for our labor... Shoot, you could spend an entire day trying to fix the sumabiches and at the end of the day get paid for 2.1 shop hours...