Been using the MPro7(No smell) for almost 9 months now after years of Hoppes#9 and my old favorite Shooters Choice. Always use Break-Free CLP unless I use old bottle of Outers for a lighter oil(Ruger MkII Target). With stainless steel needing more lube I find the Break-Free has an un-noticeable 'build-up' that protects and the usual 3-4 days before oil evaporates (typical) takes longer once Break-Free gets into the metal. It's the original Slick-50 and better quality. Yes, I have used brake-cleaner and other oils in past (Remingtons' Dry Lube spray-didn't like the way some gun-parts moved).