While I was at the local indoor range a while back I was listening in on a conversation between the range manager and one of the customers about a new lubricant that Wilson Combat was selling for 1911s. The owner of the range compared it to gear oil, like what you would use in a manual transmission or a differential. Being a guy that has a 30 year old truck with a manual trans as a daily driver, I knew exactly what gear oil was like and it struck me that gear oil just might make a pretty decent firearm lubricant.
So I went down to the local parts store and picked up a bottle of Royal Purple 75w-90. I am not an engineer, but it is my understanding that synthetic oils that have two oil weights listed like the Royal Purple function like the lighter of the two at room temp, and function like the heavier of the two at operating temp. I am not certain a handgun will reach and sustain a high enough temperature for it to make a difference, but it will be interesting to see what happens. I typically run a pretty light gun oil (Gun Slick Ultra Lube), so this is a departure from the norm for me and my guns. If it doesn't work, I guess I know what I will be putting in my truck's rear diff at the next service interval.