I have been using a product called Militec-1, It is a synthetic oil and a grease is also available. Heard about this product here on Culvers some years back. Story was a father wanted to send something to his son over in the sandbox. The company sent cases of the stuff for free and the troops found it to be excellent on their firearms. Especially in the sandy conditions. Since we are not really subject to the same conditions the product should work even better. Don't know how you can upgrade excellent except give it a plus rating. I like the results I have had.