On the 3.4L engine, a high-capacity gear type oil pump provides full pressure lubrication through a full flow oil filter.

Oil is drawn up through the pick-up screen and the tube and passed through the pump to the oil filter. An oil pressure regulator valve, internal to the oil pump, controls the engine oil pressure. The oil filter is a full flow paper element unit. An oil filter bypass valve is used in order to ensure adequate oil supply, should the filter become plugged or develop excessive pressure. The bypass is designed to open at 69-83 kPa (10-12 psi).

From the filter, oil is routed to the main oil gallery. This lubricates the crankshaft and intermediate shaft bearings. A passage above the number 2 intermediate shaft bearing supplies oil to the oil distribution cover.

The oil distribution cover includes an anti-drainback valve. This valve retains a supply of oil in the overhead, as well as in the passage, below the valve after the engine is shut off.

Pressure oiling, supplied at the end of the camshaft, lubricate the rear camshaft thrust plates.