| Description | Date | Identifier | |
| Oil policy for Bentley cars and suggesting offering Tonneline Oils as an alternative. | 23th Sep 1933 | Box 145 \ 1 scan0040 | |
| Lubricating oils used on 3½ Litre Bentley cars. | 29th Sep 1933 | Box 145 \ 1 scan0041 | |
| Recommendation regarding the appropriate oils to be used for the Bentley Car. | 18th Nov 1933 | Box 145 \ 1 scan0042 | |
| Letter from the Vacuum Oil Company regarding the use of Mobiloil in a Bentley Gear Box. | 16th Nov 1933 | Box 145 \ 1 scan0043 | |
| Letter to Shell regarding the postponement of Bentley instruction books and the likely recommendation of their oils. | 20th Nov 1933 | Box 145 \ 1 scan0044 | |
| Letter from the Experimental Dept. requesting oil viscosity data from Shell-Mex & B.P. Ltd. | 25th Nov 1933 | Box 145 \ 1 scan0045 | |
| Letter to the Vacuum Oil Co. Ltd. requesting viscosity curve data for Mobiloil 'D' at low temperatures. | 25th Nov 1933 | Box 145 \ 1 scan0046 | |
| Letter to C.C. Wakefield & Co. Ltd. requesting viscosity curves for various engine oils at low temperatures. | 25th Nov 1933 | Box 145 \ 1 scan0047 | |
| Letter to Prices Patent Candle Co. Ltd. requesting oil viscosity data at low temperatures for cold engine starting. | 25th Nov 1933 | Box 145 \ 1 scan0048 | |
| Letter from C. C. Wakefield & Co. regarding a query on oil viscosity. | 27th Nov 1933 | Box 145 \ 1 scan0049 | |
| Letter from Vacuum Oil Company acknowledging a query regarding oil viscosity. | 27th Nov 1933 | Box 145 \ 1 scan0050 | |
| Letter from Price's Patent Candle Company Limited regarding an enquiry for viscosity figures for Motorine C oil. | 28th Nov 1933 | Box 145 \ 1 scan0051 | |
| Letter to Messrs Prices Patent Candle Co. Ltd requesting comparative viscosity figures for competitor motor oils. | 30th Nov 1933 | Box 145 \ 1 scan0052 | |
| Letter from the Vacuum Oil Company discussing oil viscosities at various temperatures. | 30th Nov 1933 | Box 145 \ 1 scan0053 | |
| Letter from Vacuum Oil Company discussing figures for Mobiloil A, AF and Arctic. | 30th Nov 1933 | Box 145 \ 1 scan0054 | |
| Letter from the Vacuum Oil Company discussing the suitability of Mobiloil 'EP' for engine and gear lubrication. | 30th Nov 1933 | Box 145 \ 1 scan0055 | |
| Letter from Vacuum Oil Company Limited discussing the viscosities of different Mobiloil Aero lubricating oils. | 30th Nov 1933 | Box 145 \ 1 scan0056 | |
| Viscosity data for different Mobiloil Aero grades at various temperatures. | 1st Dec 1933 | Box 145 \ 1 scan0057 | |
| Letter to the Vacuum Oil Company Ltd. acknowledging receipt of information on oil viscosities. | 1st Dec 1933 | Box 145 \ 1 scan0058 | |
| Letter from the Vacuum Oil Company regarding engine oil temperatures, sludge formation, and filtration. | 1st Dec 1933 | Box 145 \ 1 scan0059 | |
| Table comparing the viscosity of various oils in Centipoises at different temperatures. | 30th Nov 1933 | Box 145 \ 1 scan0060 | |
| Comparative table of properties for various grades of oil. | 1st Nov 1932 | Box 145 \ 1 scan0061 | |
| Letter from Shell-Mex and B.P. Ltd responding to a query about oil viscosity and the limitations of extrapolating data. | 2nd Dec 1933 | Box 145 \ 1 scan0062 | |
| Table detailing the absolute viscosity of Aeroshell oil at various temperatures. | 12th Dec 1933 | Box 145 \ 1 scan0063 | |
| Laboratory memo regarding viscosity tests on oil samples, equipment limitations, and the acquisition of a new viscometer. | 12th Dec 1933 | Box 145 \ 1 scan0064 | |
| Viscosity curve graph for 'Motorine C' oil. | 11th Feb 1933 | Box 145 \ 1 scan0065 | |
| Graph showing the viscosity curve for Castrol XL oil. | 11th Feb 1933 | Box 145 \ 1 scan0066 | |
| Graph showing the viscosity curve for Aeroshell lubricant, plotting temperature against time. | 11th Dec 1933 | Box 145 \ 1 scan0067 | |
| Viscosity curve graph for Castrol XXL oil, plotting temperature against efflux time from a Redwood No. I viscometer. | 1st Dec 1933 | Box 145 \ 1 scan0068 | |
| Viscosity curve for Mobiloil 'D', plotting temperature against efflux time. | 11th Dec 1933 | Box 145 \ 1 scan0069 | |
| Cold test results for various oils showing the temperature at which they refuse to pour. | 20th Dec 1933 | Box 145 \ 1 scan0070 | |
| Letter to the Vacuum Oil Co. clarifying the compound used for impregnating the interior of castings. | 20th Dec 1933 | Box 145 \ 1 scan0071 | |
| Letter apologising for a missed meeting and mentioning a forthcoming analysis. | 27th Dec 1933 | Box 145 \ 1 scan0072 | |
| Letter regarding arrangements for a meeting. | 28th Dec 1933 | Box 145 \ 1 scan0073 | |
| Brief typed communication to Mr. Russell-Sharp of Vacuum Oil Co. Ltd. regarding meeting availability. | 28th Dec 1933 | Box 145 \ 1 scan0074 | |
| Viscosity-temperature chart plotting various oils with comparative values at -7°C. | 1st Nov 1933 | Box 145 \ 1 scan0075 | |
| Graph showing the approximate viscosity of a sample of compressor oil by plotting temperature against efflux time. | 14th May 1926 | Box 145 \ 1 scan0076 | |
| Letter from the Vacuum Oil Company arranging an engineer's visit. | 29th Dec 1933 | Box 145 \ 1 scan0077 | |
| Letter to the Vacuum Oil Company attaching a laboratory report on oil from a failed axle. | 2nd Jan 1934 | Box 145 \ 1 scan0078 | |
| Laboratory report analyzing a deposit sample from a Bentley Rear Axle lubricated with Mobiloil 'EP'. | 9th Jan 1934 | Box 145 \ 1 scan0079 | |
| Letter from Vacuum Oil Company regarding Mobiloil EP and a laboratory report. | 9th Jan 1934 | Box 145 \ 1 scan0080 | |
| Page 2 of a letter from Vacuum Oil Company Ltd. regarding investigations into lubricant deposits on castings. | 10th Jan 1933 | Box 145 \ 1 scan0081 | |
| Letter to Mr. Hives attempting to arrange a meeting. | 10th Jan 1933 | Box 145 \ 1 scan0082 | |
| Arranging a meeting time and alternative days. | 24th Jan 1934 | Box 145 \ 1 scan0083 | |
| Letter to Mr Hives proposing a meeting in Derby to review an advanced copy of the Bentley Instruction Book. | 24th Jan 1934 | Box 145 \ 1 scan0084 | |
| Letter discussing a rear axle problem and arranging a meeting. | 26th Jan 1934 | Box 145 \ 1 scan0085 | |
| Letter from the Vacuum Oil Company regarding laboratory tests on Mobiloil 'EP' and the conformity of Mobiloil Aero 'W' with specification D.T.D.109. | 26th Jan 1934 | Box 145 \ 1 scan0086 | |
| Letter from Vacuum Oil Company offering Mobiloil Aero 'H' for testing liquid-cooled engines. | 26th Jan 1934 | Box 145 \ 1 scan0087 | |
| Viscosity-temperature chart for various Castrol and Motorine oils. | 7th Feb 1934 | Box 145 \ 1 scan0088 | |
| Letter to Mr. Hives on Victoria Hotel, Bradford letterhead. | 7th Feb 1934 | Box 145 \ 1 scan0089 | |
| Travel arrangements and a potential meeting. | 7th Feb 1934 | Box 145 \ 1 scan0090 | |
| Definite news on Synchromesh and a message from G.P. concerning the recipient's son. | 17th Feb 1934 | Box 145 \ 1 scan0091 | |
| Letter from Vacuum Oil Company Limited regarding revised lubrication recommendations for Bentley cars. | 17th Feb 1934 | Box 145 \ 1 scan0092 | |
| Request from Vacuum Oil Company Limited for a new Bentley instruction book. | 8th Mar 1934 | Box 145 \ 1 scan0093 | |
| Approval of lubricating oils for RR and Bentley chassis. | 8th Mar 1934 | Box 145 \ 1 scan0094 | |
| Engine lubricating oil for the chassis. | 13th Mar 1934 | Box 145 \ 1 scan0095 | |
| Letter to the Vacuum Oil Company requesting a supply of Mobiloil D and EP for upcoming tests. | 16th Mar 1934 | Box 145 \ 1 scan0096 | |
| Letter from Vacuum Oil Company regarding the supply of Mobiloil for car trials in France. | 14th Mar 1934 | Box 145 \ 1 scan0097 | |
| Letter from the Anglo-American Oil Company regarding the supply of Essolube motor oil for a vehicle test. | 22th Mar 1934 | Box 145 \ 1 scan0098 | |
| New procedure for running in gearboxes with a specific oil mixture to prevent first gear failure. | 4th Apr 1934 | Box 145 \ 1 scan0099 | |
| Letter from the Vacuum Oil Company regarding special tests on lubricants for rear axles. | 20th Apr 1934 | Box 145 \ 1 scan0100 | |
| From ROY to Hs. concerning lubricants for Bentley cars and an attached memo to the Administration. | 27th Apr 1934 | Box 145 \ 1 scan0101 | |
| From ROY to Wor. regarding a dispute over the recommended lubricants for Bentley chassis. | 27th Apr 1934 | Box 145 \ 1 scan0102 | |
| Dispute with Price's Company over the recommended order of oil suppliers in the Bentley Instruction Book. | 5th Apr 1934 | Box 145 \ 1 scan0103 | |
| Clarifying the rationale for altering the recommended oils list for Bentley cars and not giving preferential treatment to Prices. | 7th Apr 1934 | Box 145 \ 1 scan0104 | |
| Recommendation of oils for Bentley cars, weighing the use of R.R. oils against the established Aero Shell. | 18th Nov 1933 | Box 145 \ 1 scan0105 | |
| Letter to J. Russell Sharp of The Vacuum Oil Company Ltd. arranging a meeting. | 8th May 1934 | Box 145 \ 1 scan0106 | |
| Invitation from the Vacuum Oil Company to attend a talk on cylinder liner wear in diesel engines. | 12th May 1934 | Box 145 \ 1 scan0107 | |
| Letter to E.W. Hives requesting a follow-up meeting after the Ulster T.T. Race. | 13th Sep 1934 | Box 145 \ 1 scan0108 | |
| Letter apologising for a delayed reply and proposing a meeting for the following week. | 19th Sep 1934 | Box 145 \ 1 scan0109 | |
| Letter to Mr Rowbotham concerning a 'Water Capacities Chart' that needs to be completed and returned. | 25th Sep 1931 | Box 145 \ 1 scan0110 | |
| Letter to The Vacuum Oil Co. Ltd. enclosing a Water Capacities Chart. | 27th Sep 1934 | Box 145 \ 1 scan0111 | |
| Letter from Vacuum Oil Company acknowledging receipt of car water capacity information. | 28th Sep 1934 | Box 145 \ 1 scan0112 | |
| Letter from Vacuum Oil Company suggesting suitable engine oil grades for instruction books based on weather conditions. | 3rd Oct 1934 | Box 145 \ 1 scan0113 | |
| Cover letter to The Vacuum Oil Company Ltd. enclosing requested information. | 3rd Dec 1934 | Box 145 \ 1 scan0114 | |
| Letter from the Vacuum Oil Company, Limited enclosing a chart requested by Rolls-Royce. | 6th Dec 1934 | Box 145 \ 1 scan0115 | |
| Completed lubrication and specification questionnaire for three 1935 car models. | 1st Jan 1935 | Box 145 \ 1 scan0116 | |
| Letter from the Vacuum Oil Company concerning winter grades of engine lubricating oil. | 7th Dec 1934 | Box 145 \ 1 scan0117 | |
| Letter from Vacuum Oil Company Ltd. regarding the advantages of using a special grade of winter oil. | 7th Dec 1934 | Box 145 \ 1 scan0118 | |
| Specification comparison sheet for Mobiloil D and Mobiloil AF. | 22th Dec 1932 | Box 145 \ 1 scan0119 | |
| Combined Royal Automobile Club trial report and National Physical Laboratory investigation into Mobiloil 'A.F' lubricating oil. | 22th Dec 1932 | Box 145 \ 1 scan0120 | |
| Cold starting, showing a 40% torque reduction when changing from Mobiloil 'B' to 'A' at 0°C. | 10th Dec 1934 | Box 145 \ 1 scan0121 | |
| Data from the National Physical Laboratory on torque and horsepower for a 6-Cylinder 16 HP engine at 0°C. | 1st Jan 1933 | Box 145 \ 1 scan0122 | |
| Letter from the Vacuum Oil Company regarding cold starting tests conducted at the University of Birmingham. | 13th Dec 1934 | Box 145 \ 1 scan0123 | |
| Report discussing the influence of oil grades on engine starting performance, with conclusions from tests on a Standard 16 HP car. | 13th Dec 1934 | Box 145 \ 1 scan0124 | |
| Letter from the Vacuum Oil Company Ltd. regarding engine lubrication and thanking Standard Motor Co. Ltd. | 29th Jun 1933 | Box 145 \ 1 scan0125 | |
| University of Birmingham report on an investigation into the torque required to start an engine from cold as affected by lubricating oil grade. | 29th Jun 1933 | Box 145 \ 1 scan0126 | |
| Test method for various grades of Mobiloil, including road running and cold starting performance. | 29th Jun 1933 | Box 145 \ 1 scan0127 | |
| The derivation and methodology of motor torque measurement, including battery conditions and test conclusions. | 1st Sep 1933 | Box 145 \ 1 scan0128 | |
| Concluding statement on the reliability and accuracy of comparative data presented. | 1st Sep 1933 | Box 145 \ 1 scan0129 | |
| Running log detailing test runs with different grades of oil. | 29th May 1933 | Box 145 \ 1 scan0130 | |
| Cold room test log detailing engine starting performance with various oils. | 2nd Jun 1933 | Box 145 \ 1 scan0131 | |
| Laboratory readings table of used and unused Mobiloil A, AF, BB, D, and Gear Box oil. | 2nd Jun 1933 | Box 145 \ 1 scan0132 | |
| Graph showing certified calibration curves for a starter motor fitted to a 16 HP car. | 3rd Jan 1935 | Box 145 \ 1 scan0133 | |
| Letter from the Vacuum Oil Company regarding the testing of Mobiloil in a Bentley racing engine. | 3rd Jan 1935 | Box 145 \ 1 scan0134 | |
| Page 2 of a letter from Vacuum Oil Company Ltd. listing the benefits of their new engine oils. | 3rd Jan 1935 | Box 145 \ 1 scan0135 | |
| Comparative analysis of Aero Mobiloil Red Band and Green Band specifications. | 3rd Jan 1935 | Box 145 \ 1 scan0136 | |
| Specification comparison table for Aero Mobiloil Red Band and Green Band. | 8th Jan 1935 | Box 145 \ 1 scan0137 | |
| Letter to the Vacuum Oil Company Ltd. requesting 10 gallons of Mobiloil for tests on Mr. Hall's Bentley. | 8th Jan 1935 | Box 145 \ 1 scan0138 | |
| Letter from Vacuum Oil Company confirming the dispatch of a 10-gallon drum of Aero Mobiloil Green Band for testing on Mr. E.R. Hall's racing Bentley engine. | 9th Jan 1935 | Box 145 \ 1 scan0139 | |
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