My current shredder (Fellowes) came with a recommendation that it is oiled each time the bin is emptied, which meant I was getting through a lot of the shredder oil sachets to keep performance at the optimum level. My shredder came with a small bottle of this oil, which seems to work well, so I purchased this larger bottle for longer term use.
The top of the bottle needs to be cut open. Fortunately I learnt from the experience of opening the small bottle that you need to remove just the tip of the nozzle with scissors and, if you do that, the red cap snaps reassuringly back into place (if you cut lower, the cap does not fit back on very well). I am happy enough with the seal provided by the red cap to store the bottle on its side.
My shredder is still as quiet as the day I bought it and continues to cope with the paper generated by a home office (it is probably emptied just over once a week on average, but can sometimes be required to work extra hard). This oil has certainly ensured that the shredder remains clog-free and this bottle size means you do not have to compromise on the amount of oil used as it lasts a long time. Other oils may work just as well but I do not want to jeopardise the longevity of my shredder by trying out anything other than an oil designed for this purpose specifically.