Does anyone know what this noise may be? Possible lifters or a rod? It just started about a week ago, not long after recent oil change. I used a Motorcraft filter and 5w30 oil. This truck isn't driven much, mainly just around town is all, it rarely ever sees above 35-40 mph also. The noise seems to get worse when the engine is warm, and increases with rpm. It sounds like its coming from under the valve cover, but I'm not 100% sure.
98 Ranger 2.5 with 5 speed