First, it must be emphasized that lubricating oil and grease absolutely cannot be used on the X-axis carbon rods of the X1 and P1.
Lubricating oil is typically used for the lubrication of linear guides, slide rails, and steel shafts.
Grease, on the other hand, is used to lubricate lead screws, or to eliminate noise issues between belts and idle pulleys.
Theoretically, lubricating oil can also be used for lead screw lubrication, but since lubricating oil is prone to evaporation, this would require more frequent reapplication of the lubricant.