The engine oil capacity on a stock 1969 Ford F100 pickup truck with a 390 cubic inch engine is 5 quarts for 2-wheel-drive models and 6 quarts for the 4-wheel drive models. The 390 cubic inch engine had a deeper sump on the 4-wheel drive models.
Some aftermarket oil pans may hold more oil than stock oil pans. Never just assume that you have the correct amount of oil in the oil pan. Always check the oil level with the engine's oil dipstick for an accurate capacity reading on every vehicle.
Always check the engine's oil level with the vehicle parked on a flat surface with the engine off and the parking brake applied.
