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).
Engine oil specifications for Vauxhall and Bedford models from 1937 onwards.
| Identifier | ExFiles\Box 127\4\ scan0111 | |
| Date | 5th August 1937 | |
| Vauxhall Motors Ltd. SPECIFICATION L.14. Engine Oil Specifications for Vauxhall and Bedford - 1937 and Future Models. 1. Composition. The oil shall be properly refined mineral oil. Oils which are compounded with a fatty oil are permissible provided that their fatty oil content does not exceed 5% and that the fatty oil is not castor oil or a similar readily oxidisable oil. In such compounded oils the fatty acid must not exceed 0.20% calculated as oleic acid. 2. Viscosity Grading and Physical Characteristics. Grade. | VIS 10. | VIS 20. | VIS 30. --- Redwood Seconds Max. Viscosity Ratio. | 10 | 17 | 25 --- Viscosity in Redwood Seconds. | 70°F.{Mr Friese} 400 max. | 850 max. | 1500 max. | 200°F.{Mr Friese} 40 min. | 50 min. | 60 min. --- Pour Point | - 15°F.{Mr Friese} max. | 10°F.{Mr Friese} max. | 15°F.{Mr Friese} max. --- Open Flash | 390°F.{Mr Friese} min. | 400°F.{Mr Friese} min. | 410°F.{Mr Friese} min. --- Uses. | Special Winter. Air temp. below 15°F.{Mr Friese} | General Use. Air temp. 15°F.{Mr Friese} to 90°F.{Mr Friese} | Special Summer or Hard Driving Conditions. Air temp. over 90°F.{Mr Friese} H.{Arthur M. Hanbury - Head Complaints} S. Bavister. 5th August, 1937. | ||