Interestingly enough, I found that Mobil 1 5W-40 works wonders on my 1911 target pistol. Seemingly better than Remoil or any of the other commercial gun products. I tried it on a whim, and was quite pleased with the results.
It simply seems to keep the gun from developing deposits and it runs quite smoothly with the M1.
Obviously, the 1911 is not highly stressed, and the stainless slide has very little loading.