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Understanding the relationship between pressure and flow running the free flowing 30 grade oil recommended in the owners manual... Choosing a 30 over a 40 or 50 is smarter because it will: 1)increase HP at the rear wheel 2)quicken the throttle response coming out of the corners... 3)decrease over all operating temps... 4)increase the oil flow at the critical bearings... I started with a $135 compact digital oil pressure gauge p/n P210 from Auber Instruments with a 0-150 psi or 10 bar range... http://www.auberins.com/ Installing Auber's senor was complicated because I wanted the to keep the stock Honda sensor that signaled the red low oil pressure light on the instrument cluster... I engineered this arrangement... Different threads required multiple fittings... I starter with the hole in the engine which are BSP threads... next came a BSP to NPT adapter... which allowed a NTP Tee for the NTP Auber sensor... finally I screwed the BSP Honda sensor into the NPT Tee threads which held but leaked... so I sealed it up with a custom double O ring washer... I machined a Double O Ring washer to insure against an oil leak... It took 5 attempts to come up with the right angles and holes before the Delrin Clamp Mod worked like I wanted... The 5th Delrin Clamp was perfect... Machined Delrin clamp installed to anchor the long and ponderous Auber sensor to the bike... Carbon Fiber plate was used to secure the Oil Press Gauge to the instrument cluster... All in all this mod consumed close to 30 day of labor but it was worth it... Now I'm able to evaluate my oil versus viscosity... I choose 0W30 because it gives the right flow at the normal operating temperature of 212ºF of the engine and that would be the viscosity of 10 at operating temps... so that means for every 1000 rpms increase Mr.RC45's oil pressure increases another 10 psi... a 30w flows more oil at higher rpms which flows more oil between the critical bearings which carries away more heat and I'm not wasting HP just pumping oil through the blow off valve... 0w30 psi 1000 10 2000 20 3000 30 4000 40 5000 50 6000 60 7000 70 8000 80 9000 90 10000 99 11000 99 blow off by the pressure relief valve 0w40 1000 12 2000 24 3000 36 4000 48 5000 72 6000 84 7000 96 8000 99 blow off by the pressure relief valve 9000 99 10000 99 11000 99 15W50 psi 1000 15 2000 30 3000 45 4000 60 5000 75 6000 90 7000 99 blow off by the pressure relief valve 8000 99 9000 99 10000 99 11000 99 Quote Mobil 1 on the viscosity of their synthetic 0 30 weight oil: Temperature ( F )....Viscosity Flow 212ºF..........................10 (operating) 104ºF..........................56 (start up) 32ºF..........................100 (estimate) Mr.RC45 Oil Press Gauge shows the problem with oil... it doesn't want to flow when its cold this is 0w30 at 112º resisting at 18 psi The same 0w30 at 203F Oil is flowing 10 psi perfect