The rails are properly lubricated already, so you do not need to lubricate them. The bearings also help to ensure smooth operation. Adding more lubricant can clog the ball bearings with dust and cause operation failures.
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According to Kenneth Taylor, the 3 best cold air intakes for your chevy Silverado are the K&N Cold Air Intake Kit 77-3082KP, the K&N Cold Air Intake Kit 63-3082 and the K&N Cold Air Intake Kit 57-3058.