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Lucas Synthetic Oil Test Engine

Our test regiment includes running the engine with both conventional and synthetic oil in normally aspirated and turbocharged trims. Tested on the normally aspirated application, the lightweight synthetic oil was worth 8 hp measured peak to peak, but the gains were as high as 9-10 hp elsewhere along the curve.
Friction-Fighting Formula - Garage Tech

Our test regiment includes running the engine with both conventional and synthetic oil in normally aspirated and turbocharged trims. Tested on the normally aspirated application, the lightweight synthetic oil was worth 8 hp measured peak to peak, but the gains were as high as 9-10 hp elsewhere along the curve.  View Related Article