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Lucas Synthetic Oil Test Bottles

Switching from the 20W-50 conventional oil to the 5W-20 synthetic oil on our turbocharged B18C engine increased power output by 10-11 hp.
Friction-Fighting Formula - Garage Tech

Switching from the 20W-50 conventional oil to the 5W-20 synthetic oil on our turbocharged B18C engine increased power output by 10-11 hp.  View Related Article