Used Nissan truck, 2.4L engine, oil was changed by the dealer just before delivery, but I don't remember what color it was back then. I changed it again 1500 miles later, and it still had a red tint to it after the change. What could make the oil red? I don't think that automatic transmission fluid or power steering fluid is leaking in, and the antifreeze is green. All I can think of is that somebody added ATF to the engine to fix a ticking hydraulic lifter (no noise now, this is one of the few Nissans with hydraulic lifters).