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Lucas Synthetic Oil Test Dyno Graph

Given that both oil pressure and friction increase with engine speed, the power gains offered by the synthetic oil followed suit. The Lucas 5W-20 synthetic oil increased the power output of the normally aspirated B18C engine from 203 hp to 211 hp, with gains increasing alongside engine speed.
Friction-Fighting Formula - Garage Tech

Given that both oil pressure and friction increase with engine speed, the power gains offered by the synthetic oil followed suit. The Lucas 5W-20 synthetic oil increased the power output of the normally aspirated B18C engine from 203 hp to 211 hp, with gains increasing alongside engine speed.  View Related Article