National Geographic : 1943 Nov
RING-FREE Motor Oil saves gasoline 2 ways Carbon on pistons, rings, valves decreases motor efficiency-leads to loss of power wastes gasoline. Macmillan RING-FREE Motor Oil removes carbon while you drive ! That means better motor operation and substantial gasoline savings. The 2nd thing RING-FREE does to save gasoline is reduce friction fast! Reducing motor friction releases more power to your car's rear wheels, and that really cuts gasoline waste. SOLD BY INDEPENDENT DEALERS I IIII Here's proof: In scores of certified road tests, with various makes of owner-driven cars, an average gasoline saving of 1.3 miles per gallon was reported after crank cases had been drained and refilled with RING-FREE Motor Oil. Let Macmillan RING-FREE help S you save gasoline two ways. Let it make your car last longer, too, by removing carbon, reducing friction and giving more thor ough motor lubrication. MACMILLAN PETROLEUM CORP. 50W.50th,NewYerk;624S.Mchlin Av.,Chicagl; 530W.6th,LosAngeles Copyright 1943 Macmillan Petroleum Corp.