I used to use rem oil for my revolvers. But I bought some of S&W's advanced gun oil and it works far better. I can spin my cylinder and it just keeps going with the gun open. For autos I use TW25B. Used it on deployment and loved it. Stays where it's put and doesn't attract sand or dust and doesn't burn off. Every time I run out I try something different. Figure it's the only way to find what works best for me.