Oil screens on Chevys with active fuel management have a tendency to gum up and cause low pressure readings. When added to oil, Sea Foam Motor Treatment (or better yet, High Mileage Motor Treatment) will clean anywhere the oil flows in the crankcase. Try adding 1 oz of High Mileage for each quart of oil in the crankcase.
Oil screens on Chevys with active fuel management have a tendency to gum up and cause low pressure readings. When added to oil, Sea Foam Motor Treatment (or better yet, High Mileage Motor Treatment) will clean anywhere the oil flows in the crankcase. Try adding 1 oz of High Mileage for each quart of oil in the crankcase.