You can use fully synthetic lubricating silicone grease, and Hutou hotolube or kluber's are all very good. Taobao leopard has a toothpaste-like package of130g. This grease meets food-grade safety standards, is colorless, transparent, low temperature resistant, water resistant, durable and durable, and provides professional protection for fitness equipment.
Don't use engine oil or ordinary butter in this place. It will splash out during exercise, freeze in winter and give off a harmful smell.