Quote:
Originally Posted by PontiacLars
Johnson hydraulics.
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There have not been reports of those lifters being very sensitive to oil viscosity. There have been some guys that have said sometimes thicker oil made more power on the dyno with some hydraulic rollers combos.
I attached Driven’s cheat sheet for their oils with different operating temps and oil clearance. Also a chart comparing viscosity in cSt versus temp (*F) between a 5w50 FR50 driven and 20w50 Valvoline VR1. The cSt is on the vertical. Driven FR50 is competition for Valvoline VR1 5w50, I would expect those two oils viscosity to be similar. Not far after about 150*F the 5w50 and 20w50 VR1 the viscosity looks similar.