Anyone know what HK recommends? Can't seem to find a good answer after Google, searching on this forum, manual search. Some use just CLP, some use white lithium grease, some use mobile one synthetic etc. My question is what is the upside to lithium grease and other products and what are the downsides? Will either hurt the polymer in the long run? Grease stays longer on say the rails, but is oil a better overall lubricant? I'm gearing this question to the guys here that have put thousands of rounds through their HK guns.