"Lubrication of the carriage is difficult, but not impossible, without removal from the rail. The easiest method to lubricate whilst installed is to use a light oil such as “3-in-1 oil” or sewing machine oil." I was reading this on the RatRig website. I have some 3 in 1 oil with no adatives. I was wondering if I can use a syringe I have and put this into the little ports that are on either side of the cariages as oposed to onto the rails. I seems to me it will be less messy. I really do not want to mess this up! Would I be better of forcing in some kind of grease instead like the stuff I use on the Prusa rods? There seems to be 500 different opinions on this topic after searching. The injection of the 3 in 1 every now and again seems to make sense to me but these are also my first linear rails as well. Any advice appreciated. Will remove this to avoid clutter if its the wrong place. Its not really fix my printer but I wanted there to be a thread to it rather than the answers get lost in the chat. Appreciate anyone who takes the time to read this!