What does Technician A say is indicated by oil leaking out of the exhaust ports?

Oil leaking out of the exhaust ports is typically indicative of worn engine intake valve guides. This condition occurs when the valve guides allow oil to leak into the combustion chamber, where it then burns off during the engine's operation. When the oil is burned, it can appear as blue smoke from the exhaust, and in some cases, oil can leak directly from the exhaust ports if the wear is significant.

The scenario described is specific to issues related to the valve train of the engine. Worn valve guides are a common failure point in engines, especially in high-mileage applications or engines that have been subjected to excessive stress or poor maintenance.

Other options such as a blocked air cleaner, excessive turbo pressure, or faulty spark plugs do not directly relate to oil leaking from the exhaust ports. A blocked air cleaner can affect engine performance by restricting airflow, excessive turbo pressure may indicate a problem with turbocharging but does not lead to oil leaking from the exhaust, and faulty spark plugs generally result in misfires rather than oil leakage.