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).
Recommendation to update instruction books regarding the use of 'Zero' antifreeze and its comparison with Glycerine and Glycols.
| Identifier | ExFiles\Box 151\3\ scan0264 | |
| Date | 3rd November 1938 | |
| -2- We suggest, therefore, that all our instruction books should recommend Price's "Zero" as well as Ethylene and Methylene Glycols. Glycerine is inferior to Ethylene Glycol as an antifreeze by virtue of its greater viscosity, the fact that a larger quantity must be used and the fact that it tends to cause frothing. The first two points are unimportant, and the latter only becomes important if the car in question is one with a tendency to lose water continually - in this case the tendency would be increased by the use of Glycerine. Where it is necessary to explain to a customer why we are now able to recommend "Zero", we suggest that it is pointed out that its descaling tendencies have been reduced by the addition of a corrosion inhibitor and that frothing is now of less importance since we have very much reduced, if not entirely eliminated, the question of water loss on all our present models. The alteration recommendation mentioned above need only apply to instruction books for current models - if customers owning previous models enquire about "Zero" they can be told that it will not harm their car in any way, but may result in increased loss of coolant due to frothing. RM {William Robotham - Chief Engineer} /Std. | ||