Mobil makes a 10W30 racing oil thats high in zinc ,thats what the engine guy that does my machining says is good for break in ,he sells it for 5.00 a qt.the 15W40 is to heavy an oil for breaking in a new engine so my engine guy says and my Son in law who races dirt track cars.I'd go with any good 10 or 15W30 oil after the frist 250 to 500 miles ,good cold weather flow on start up and the new oils are much better than 25 years ago for protection.
Pete
