I like it when the companies post test results, such as the one from FP10 below. Smaller number is better. I found a few bottle of Break Free LP on sale awhile back, but it looks like I should use it for tool storage.
http://www.fp10.com/
INDEX NO. PRODUCT NAME
0.9 Firepower FP-10 Lubricant EliteTM
2.0 Eezox Synthetic Gun Oil
2.1 Tetra Gun Grease (synthetic)
3.3 Minuteman High Tech Gun Oil
6.2 TRI-FLOW (PTFE)
6.6 Tetra-Gun Oil (fluorocarbon synthetic)
7.0 Pro-lix Dry Film Lube
24.8 Blue Spectre Gun Oil (moly disulfide)
27.8 Molube-Alloy (moly disulfide) 777-1
27.9 TUFOIL (PTFE)
30.2 Break Free CLP (PTFE)
34.6 Birchwood-Casey “Sheath”
39.9 Hornaday “ONE SHOT” (aerosol)
43.6 Sports Lube Rod & Gun Oil
48.4 Kleenbore Super Lube (aerosol)
49.3 LSA Springfield Armory
52.7 Rusty Duck
52.7 Pro-Shot All Weather Gun Oil
54.4 3 in 1 “Plus” (aerosol)
55.2 WD-40
56.6 RNI Liquid Gunsmith
58.8 Military Lube oil AXS-72 (obsolete)
62.8 G-96 Gun Treatment (aerosol)
65.0 Parker-Hale Express Gun Oil
67.4 Hoppes lube oil
68.3 Rem-oil w/Teflon (PTFE)
71.1 Kleenbore Formula 3 oil
72.1 RIG +P Stainless Steel Lube
73.8 Koppers/S.A. All Weather Weapons Lube
77.3 Kleeroil (Am. Writing Ink Co.)
79.6 TRI-FLON (oil w/PTFE)
102.9 Super Lube jel (Bohemia, NY) PTFE
499.0 Break Free LP (lube/preservative) PTFE