Agree with Michael. The inboard or piston side will retract slightly from the rotor but the outside pad stays close. If the slider lubricant is heavy, contaminated or dried out, the caliper won't back away and will keep the outboard pad close. Even with a good system, I think the outer pad will wear a little faster because it stays close to the rotor.
I was using Syl-Glide but have found a newer synthetic brake slider grease that seems to work well. The thing about sliders is that many just lubricate the bolt, but the sleeve needs to be pulled out, the bore in the caliper cleaned and the sleeve and bolt cleaned, then re-lube the bore, the inside of the slider and the O-rings.
The high temp lube is Permatex Ceramic Extreme Brake Parts Lubricant. It isn't as heavy as the Syl-Glide lube. Both are synthetic and won't harm the O-rings.