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).
Viscosity of lubricating oils for gearboxes and advising against using overly thick oils.
| Identifier | WestWitteringFiles\C\September1919\ Scan8 | |
| Date | 4th September 1919 | |
| ORIGINAL To W.O. from R.{Sir Henry Royce} Copy to Ed.{J. L. Edwards} * DIV.* * El.* * T.* * OX.* * NA.{Mr Nadin}* * REV.* * INV.* 8 SEP 1919 RECEIVED RE LUBRICATING OILS. 3 H7/04/9/19. X.1434 Thank you for your memo WD{Mr Wood/Mr Whitehead}1/NJ2/9/19. I have endeavoured for some time past to avoid the use of the very thick oil in the gear box, which in winter so increases the difficulty of changing gear. I think the thickest oil we ought to use should not be thicker than Castrol, and I think Price's Amber Gear Oil is, if anything, too thick, and Battersea gear oil is altogether much too high in viscosity. None of this should be bought or stocked, or recommended for use on cars or anything else. H.{Arthur M. Hanbury - Head Complaints} | ||