From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison of Mobiloil grades, highlighting the advantages of the Clearosol Process in terms of viscosity and reduced oxidation.
| Identifier | ExFiles\Box 145\2\ scan0058 | |
| Date | 1st February 1935 guessed | |
| No. 4. WINTER GRADES. Mobiloil "A" | Average | Ordinary (Clearosol Process) | High Grade Motor Oil. | Motor Oil. ---------------------------|-------------------------|------------- Viscosity @ 70°F (Redwood) | 1350" | 1600" | 1800" Viscosity @ 200°F (Redwood)| 65" | 63" | 57" As easy starting in winter depends upon the flatness of the viscosity curve, the benefits of the Clearosol Process are clearly proved, particularly when it is remembered that the lubricating properties of the new oils are also superior. Reduced Oil Oxidation. To illustrate the advances in the new oils as regards carbon deposits, sludging and valve gumming, interesting figures are quoted hereunder. Mobiloil "BB" | Typical (Clearosol Process) | High Grade Motor Oil. -----------------------------|------------------------ Coke No. before oxidation | 0.31% | 0.60% Coke No. after oxidation | 0.88% | 1.8% Increase in viscosity | @ 100°F after oxidation | 1.31 times | 1.70 times Figures such as these require no comment. Aero Mobiloil. These products have also been treated by the new Clearosol Process with the same beneficial results. Aero Mobiloil Red Band supercedes Mobiloil Aero W. Aero Mobiloil Green Band supercedes Mobiloil Aero H.{Arthur M. Hanbury - Head Complaints} Availability and Prices. Distribution of the new Mobiloil grades (Clearosol Process) for motor car and motor cycle use is now taking place, | ||