Internally. Lubricated. Parts. That's all that is covered by the power-train warranty. So when in doubt think, does this have oil IN it? No? Should it? Yes! That part should be covered. None of the electronics or wear and tear bits(breaks, wipers, tires) are under that protection. With the new lifetime warranty, I went through the warranty coverage in pretty great detail with the finance manager to ensure I had a grasp on it.