Brand / weight / model nominal weight Reported cSt @40C (centiStokes) Reported cSt @100C (centiStokes) Reported Viscosity Index (VI) Recaclulated Viscosity Index (VI) Viscosity/ Temperature Coefficient (VTC) VT (cSt@40/cSt@100) Red Line (like water, Clear) 5.5 2.3 344 343 0.58 2.39 Red Line (extra light, Blue) 9.8 4 402 403 0.59 2.45 Spectro, Golden (ultra light) 10.4 4.4 385 440 0.58 2.36 RockShox (2.5w Light cartridge (Torco 5) 2.5 10.75 4 325 340 0.63 2.69 Torco RFF 5 5 10.75 4 325 340 0.63 2.69 Bel-Ray HVI (3 wt) 3 11 3.85 296 297 0.65 2.86 Kayaba (K2-S shock) 11.3 4 310 310 0.65 2.83 Showa Suspension Fluid SS-25 (2.5wt. Stock Shock, OEM) 2.5 12.5 3.9 239 239 0.69 3.21 Silkolene Pro RSF (2.5wt) 2.5 13.6 5.83 464 465 0.57 2.33 Maxima Racing Shock Fluid (light, 3wt) 3 14 5.2 378 370 0.63 2.69 Torco RSF Light (purple) 14.5 4.7 288 286 0.68 3.09 PJ1 Cartridge Pro For Fluid (3.5 wt) 3.5 14.6 3.6 134 0.75 4.06 Castrol Fork Oil (10wt) 10 15 4 150 179 0.73 3.75 RaceTech (Motorex) (Light US1) 4.25 15.2 4.4 222 226 0.71 3.45 Penske (lightweight shock fluid) 15.5 6.3 434 434 0.59 2.46 Kayaba 01 (zero-One Fork) 15.6 3.45 150 96 0.78 4.52 Yamaha 01 Fork oil (Kayaba) 15.6 3.45 150 96 0.78 4.52 Showa Suspension Fluid SS-05 (Stock fork, OEM) 15.65 3.6 116 113 0.77 4.36 Maxima Bicycle Fork fluid (5wt) 5 15.9 3.51 150 98 0.78 5.53 Maxima Fork oil (5 wt) 5 15.9 3.51 150 98 0.78 4.53 Maxima Racing Fork fluid (85/150, 5 wt) 5 15.9 3.51 150 98 0.78 4.53 Motul Fork Oil (Very Light ) ?? 16 3.5 100 95 0.78 4.57 Rockshox (52 Medium, Hydracoil) (Torco 7) 7 16.1 5.05 285 280 0.69 3.19 Torco RFF 7 7 16.1 5.05 285 280 0.69 3.19 Motul Shock Oil (2.5-20) 16.1 6.2 400 403 0.61 2.6 showa Suspension Fluid SS-7 (5wt) (Apolo) 5 16.44 3.76 135 119 0.77 4.37 Spectro, Golden Spectro cartridge Fork Fluid (85/150, Very light) 16.9 3.82 150 119 0.77 4.42 Honda Pro HP Fork Oil (5wt) 5 17 3.8 140 115 0.78 4.47 Pro-Circuit PC-Oil 17 4.1 149 0.76 4.15 Bel-Ray Fork Oil (5 wt) 5 17.1 4.1 146 147 0.76 4.17 Kayaba G5 5 17.7 3.5 72 72 0.8 5.06 ELF Moto Fork oil SYN (2.5) 2.5 18 4 121 122 0.78 4.5 Motul Fork Oil, Comfort (Light 5) 5 18.2 4 124 119 0.78 4.55 Motul Fork Oil, Factory Line (Light 5) 5 18.3 4.2 138 138 0.77 4.36 Red Line (Light, Yellow) 18.4 7.1 407 409 0.61 2.59 Agip Fork (2.5 wt) 2.5 18.5 4.37 152 153 0.76 4.23 Bardahl (52 Fork Oil) 19.3 5.1 212 212 0.74 3.78 Bel-Ray HVI (5wt) 5 19.5 6.66 345 345 0.66 2.93 Torco RFF 10 10 19.9 5.7 260 256 0.71 3.49 Motul Fork Oil (Light) ?? 20 6 260 280 0.7 3.33 Spectro, SX 400 20.9 8.9 400 460 0.57 2.35 Maxima Racing Shock Fluid (Medium, 7wt) 7 21 7.3 349 358 0.65 2.88 Spectro Fork Oil (5wt) 5 21.6 4.4 119 114 0.8 4.91 Agip Fork (5wt) 5 22 5.2 175 178 0.76 4.23 Silkolene Fork Oil (5wt) 5 22.3 4.4 106 107 0.8 5.07 Motul Fork Oil, Factory Line (Medium, 5-10) 7.5 22.3 6.2 254 253 0.72 3.6 Elf Moto Fork OIL SYN (5) 5 23.3 4.8 130 129 0.79 4.85 PJ1 Fork Tuner (2.5wt) 2.5 26.1 4.9 111 0.81 5.33 Spectro, Golden Spectro Cartridge Fork Fluid (125/150, Very Light) (Marzzochi) 26.1 5.25 150 135 0.8 4.97 Spectro, Golden (Very Light) 26.4 9.9 400 397 0.63 2.67 Maxima Racing Fork Fluid (125/150), 7wt) 7 26.7 5.36 151 138 0.8 4.98 Silkolene Pro RSF (5wt) 5 26.7 9.46 372 372 0.65 2.82 PJ1 Fork Tuner (7.5wt) 7.5 27.5 5.1 113 0.81 5.39 Castrol Synthetic Fork Oil (5wt) 5 28 5.7 151 149 0.8 4.91 Ohlins (Shock) 28.7 9.4 340 340 0.67 3.05 Bel-Ray Fork Oil (7wt) 7 29 5.2 110 108 0.82 5.58 Maxima Racing Shock Fluid (Heavy, 10wt) 10 29 9.4 334 336 0.68 3.09 Ohlins (High Performance) 30.25 10.18 352 352 0.66 2.97 Red Line (Medium, Red) 30.4 10.8 369 374 0.64 2.81 Agip Fork (7.5wt) 7.5 31 6.4 163 165 0.79 4.84 PJ1 Fork Tuner (5wt) 5 31.2 5.4 106 0.83 5.78 Fox Shox (Torco RSF Medium) 31.82 9.57 300 309 0.7 3.32 Torco RSF Medium (Purple) 31.82 9.57 300 309 0.7 3.32 Maxima Bicycle Fork Fluid (10wt) 10 32 6.28 151 151 0.8 5.1 Maxima Fork Oil (10wt) 10 32 6.28 151 151 0.8 5.1 Spectro Fork Oil (10wt) 10 32.8 5.6 111 107 0.83 5.86 RaceTech (Motorex) (Medium US2) 10 32.9 7.2 200 192 0.78 4.57 Bel-Ray Fork Oil (10wt) 10 33 5.9 123 123 0.82 5.59 RockShox (10wt) (Torco 15) 10 33 8.4 240 247 0.75 3.93 Torco RFF 15 15 33 8.4 240 247 0.75 3.93 Shell Advance Fork 5 5 33.05 7.09 185 185 0.79 4.66 Kayaba G10S 10 33.2 5.7 111 111 0.83 5.82 Bel-Ray HVI (10wt) 10 33.5 10 306 308 0.7 3.35 PJ1 Fork Tuner (10wt) 10 33.9 5.7 106 0.83 5.95 Red Line D4 ATF 34 7.5 198 197 0.78 4.53 Mobil 1 Synthetic ATF 34 7.6 199 202 0.78 4.47 Silkolene Fork Oil (10wt) 10 34.9 7.05 169 169 0.8 4.95 Motul Fork Oil, Comfort (Medium 5-10) 7.5 35.3 6 115 114 0.83 5.88 Bardahl (10w Fork Oil) 10 35.5 6.9 158 158 0.81 5.14 Showa Suspension Fluid SS8 (10wt) (Apollo) 10 36.47 7.24 200 167 0.8 5.04 Silkolene Pro RSF (7.5wt) 7.5 37 12 322 339 0.68 3.08 Shell Advance Fork 10 10 38.97 7.44 161 161 0.81 5.24 Castrol Synthetic Fork Oil (10wt) 10 42 7.5 150 147 0.82 5.6 RockShox (15w Extra Heavy) (Torco 20) 15 42.8 10.4 250 245 0.76 4.12 Torco RFF 20 20 42.8 10.4 250 245 0.76 4.12 Agip Fork (10wt) 10 45 8.3 164 162 0.82 5.42 Elf Moto Fork Oil SYN (10) 10 45.4 7.6 135 134 0.83 5.97 Spectro Fork Oil (15wt) 15 45.6 7.2 119 118 0.84 6.33 Repsol Moto Horquillas Fork Oil (10W20) 46 8.4 150 161 0.82 5.48 Maxima Bicycle Fork Fluid (15wt) 15 46 8.48 154 163 0.82 5.42 Maxima Fork Oil (15wt) 15 46 8.48 154 163 0.82 5.42 Maxima Racing Fork Fluid (235/150, 15wt) 15 46 8.48 154 163 0.82 5.42 Castrol Fork Oil (15wt) 15 46.5 8.3 150 155 0.82 5.6 ELF Moto Fork Oil (10wt) 10 47 8.3 153 153 0.82 5.66 Spectro, Golden (light) 47.27 16.76 235 370 0.65 2.82 Kayaba G15S 15 47.3 7.2 112 112 0.85 6.57 Silkolene Pro RSF (10wt) 10 47.36 13.69 303 303 0.71 3.46 Silkolene Fork Oil (15wt) 15 48.45 8.5 153 153 0.82 5.7 Bel-Ray HVI (15wt) 15 49 13.9 297 298 0.72 3.53 Bel-Ray Fork Oil (15wt) 15 53 7.5 103 103 0.86 7.07 Red Line High Temp ATF 53.9 10 172 176 0.81 5.39 PJ1 Fork Tuner (15wt) 15 55.3 8.7 133 0.84 6.36 Motul Fork Oil, Factory Line (Heavy, 15-20) 61 13.2 224 225 0.78 4.62 PJ1 Fork Tuner (20wt) 20 61.7 8.4 106 0.86 7.35 Spectro Fork Oil (20wt) 20 65 8.9 110 111 0.86 7.3 Maxima Bicycle Fork Fluid (20w) 20 65 12.9 201 204 0.8 5.04 Maxima Fork Oil (20w) 20 65.6 12.9 201 202 0.8 5.09 Red Line (Heavy) 66.8 16 256 256 0.76 4.18 Shell Advance Fork 15 15 67 10.37 120 143 0.85 6.46 Silkolene Fork Oil (20wt) 20 67.7 8.75 101 101 0.87 7.74 Castrol Fork Oil (20wt) 20 68 11.2 150 159 0.84 6.07 Repsol Moto Horquillas Fork Oil (15W30) 68 11.2 150 159 0.84 6.07 Agip Fork (15wt) 15 69 11.5 162 163 0.83 6 Elf Moto Fork Oil (15) 15 72.6 11.6 155 155 0.84 6.26 Bel-Ray Fork Oil (20wt) 20 73.5 9.5 106 107 0.87 7.74 Motul Fork Oil, Comfort (Heavy, 15-20) 77.9 10.1 111 112 0.87 7.71 Torco Synthetic RTF 82.5 14.33 182 182 0.83 5.76 Motorex Semi-Bath fork oil, 5W40 90.9 14.6 169 168 0.84 6.23 Silkolene Pro RSF (15wt) 15 92.5 19.5 235 233 0.79 4.77 ELF Moto Fork Oil (20) 20 99 14.6 150 153 0.85 6.78 Agip Fork (20wt) 20 104 15.03 155 151 0.86 6.92 Silkolene Fork Oil (30wt) 30 105 11.84 101 102 0.89 8.87 Bel-Ray Fork Oil (30wt) 30 105 12 104 104 0.89 8.75 Kayaba G30S 30 116.1 16.7 156 156 0.86 6.95 PJ1 Fork Tuner (30wt) 30 116.9 15 133 0.87 7.79 Spectro, Golden American 4 (20w50) 155 19.6 146 145 0.87 7.91