| Description | Date | Identifier | |
| Letter from Vacuum Oil Company Limited arranging tests for their new Mobiloil with a 40/50 HP engine. | 15th Feb 1935 | Box 145 \ 1 scan0140 | |
| Page two of a letter from Vacuum Oil Company, Ltd. regarding research and the supply of Mobiloil 'D'. | 21th Mar 1935 | Box 145 \ 1 scan0141 | |
| Testing and potential recommendation of a new oil, Mobiloil - Clearosol. | 21th Mar 1935 | Box 145 \ 1 scan0142 | |
| Questioning the necessity of oil type labels on engines, based on whether mixing recommended oils is harmful. | 9th May 1935 | Box 145 \ 1 scan0143 | |
| From Sg to Hs requesting a reply regarding a previous conversation with Russell Sharp. | 16th May 1935 | Box 145 \ 1 scan0144 | |
| Letter from Vacuum Oil Company regarding the analysis of Mobiloil 'D' samples from a test car after a 20,000 mile test. | 9th Sep 1935 | Box 145 \ 1 scan0145 | |
| Letter from the Vacuum Oil Company detailing the analysis of used Mobiloil 'D' from a Phantom III engine. | 15th Oct 1935 | Box 145 \ 1 scan0146 | |
| Letter from the Vacuum Oil Company regarding the analysis of oil deposits in an engine under test. | 27th Jan 1936 | Box 145 \ 1 scan0147 | |
| Letter to the Vacuum Oil Co. Ltd. regarding the test results of a new E.P. oil for hypoid axles. | 27th Jan 1936 | Box 145 \ 1 scan0148 | |
| Letter from an oil company regarding Mobiloil 'EP' test results for back axle recommendations. | 8th Jan 1936 | Box 145 \ 1 scan0149 | |
| Letter from Ransome & Marles Bearing Co. confirming the satisfactory performance of Vacuum 'E.P. Mobiloil' in a 600-hour bearing test. | 7th Jan 1936 | Box 145 \ 1 scan0150 | |
| Request for two new Jaeger Revolution Counters for the No. 30 Car Unit Bed as the current ones are old and unreliable. | 29th Jan 1936 | Box 145 \ 1 scan0151 | |
| Letter from Vacuum Oil Company regarding the testing and performance of Mobiloil 'EP'. | 30th Jan 1936 | Box 145 \ 1 scan0152 | |
| Letter to The Vacuum Oil Co. Ltd. regarding test results of their EP oil, noting issues with sludge formation. | 31th Jan 1936 | Box 145 \ 1 scan0153 | |
| Letter from Vacuum Oil Company Limited regarding the performance and modification of Mobiloil 'EP' for back axles. | 11th Feb 1936 | Box 145 \ 1 scan0154 | |
| Letter from the Vacuum Oil Company regarding the mixture of Mobiloil and Castrol, and enclosing friction test results for Clearosol engine oils. | 17th Feb 1936 | Box 145 \ 1 scan0155 | |
| Comparison table of test results for various grades of Mobiloil (Clearosol Process). | 1st Mar 1935 | Box 145 \ 1 scan0156 | |
| Comparing the oil types and fluid capacities for the Phantom II and Phantom III chassis. | 12th Feb 1936 | Box 145 \ 1 scan0157 | |
| Letter from Vacuum Oil Company Limited advising on suitable Mobiloil grades for 1936 models. | 20th Feb 1936 | Box 145 \ 1 scan0158 | |
| Letter from the Vacuum Oil Company enclosing a paper on the stability of certain solvent-treated oils. | 27th Mar 1936 | Box 145 \ 1 scan0159 | |
| Letter to the Vacuum Oil Co. Ltd. regarding a sample of E.P. oil supplied for Bentley back axle tests. | 3rd Apr 1936 | Box 145 \ 1 scan0160 | |
| Letter from the Vacuum Oil Company discussing the properties of Mobiloil 'EP' and comparative performance figures for other oil grades. | 6th Apr 1936 | Box 145 \ 1 scan0161 | |
| Letter to The Vacuum Oil Company Ltd. requesting viscosity charts for engine oils. | 21th Apr 1936 | Box 145 \ 1 scan0162 | |
| Enquiry into the availability of Mobiloil 'EP' Rear Axle Oil in France. | 5th May 1936 | Box 145 \ 1 scan0163 | |
| Returning a drum of Mobiloil EP Oil to the Vacuum Oil Company for examination. | 19th Jun 1936 | Box 145 \ 1 scan0164 | |
| Cooling tests comparing a Cadillac V-16 car to the Phantom III at Brooklands. | 24th Jun 1936 | Box 145 \ 1 scan0165 | |
| Comparing the fan performance and ratios of a Phantom III to a Cadillac, suggesting modifications for improved cooling. | 24th Jun 1936 | Box 145 \ 1 scan0166 | |
| Results of radiator tests on a Cadillac car at Brooklands, with comparisons to a Phantom III. | 24th Jun 1936 | Box 145 \ 1 scan0167 | |
| Comparison of the particulars for the Ph.III and Cadillac fans. | 18th Jun 1936 | Box 145 \ 1 scan0168 | |
| Performance and cooling test results for a Cadillac V-16 car at Brooklands. | 18th Jun 1936 | Box 145 \ 1 scan0169 | |
| Summary table of radiator test results conducted at Brooklands. | 28th Jul 1936 | Box 145 \ 1 scan0170 | |
| Enquiry for suitable engine oil for a 4 1/4 litre chassis in America. | 28th Jul 1936 | Box 145 \ 1 scan0171 | |
| Suitability and availability of Essolube and Mobiloil for Bentley cars in the United States. | 29th Jul 1936 | Box 145 \ 1 scan0172 | |
| Urgent internal memo requesting the order of a 5-gallon drum of Castrol XXL Oil for Mr. E.R. Hall's car. | 19th Aug 1936 | Box 145 \ 1 scan0173 | |
| Inquiry to the Vacuum Oil Company regarding the S.A.E. numbers for Mobiloil Arctic and Mobiloil BB. | 24th Aug 1936 | Box 145 \ 1 scan0174 | |
| Letter from Vacuum Oil Company Limited discussing Mobiloil equivalents to SAE grades. | 25th Aug 1936 | Box 145 \ 1 scan0175 | |
| Letter from the Vacuum Oil Company discussing engine oil viscosity and S.A.E. classifications for winter use. | 5th Sep 1936 | Box 145 \ 1 scan0176 | |
| Letter to The Vacuum Oil Co. Ltd. requesting the procurement of a 10-gallon drum of Mobiloil Arctic Special for testing. | 18th Sep 1936 | Box 145 \ 1 scan0177 | |
| Letter from Vacuum Oil Company Limited regarding the delivery of Gargoyle Mobiloil Arctic Special. | 2nd Nov 1936 | Box 145 \ 1 scan0178 | |
| Letter to the Vacuum Oil Company confirming the delivery schedule for Mobiloil Arctic Oil. | 3rd Nov 1936 | Box 145 \ 1 scan0179 | |
| Request to Vacuum Oil Co. Ltd. for a viscosity chart for 'Arctic Special' oil. | 10th Nov 1936 | Box 145 \ 1 scan0180 | |
| Letter to the Vacuum Oil Company questioning the suitability of a special grease for Bowden cables in cold weather. | 26th Feb 1937 | Box 145 \ 1 scan0181 | |
| Letter to the Vacuum Oil Company regarding grease sent for testing in cables. | 2nd Mar 1937 | Box 145 \ 1 scan0182 | |
| Letter from Vacuum Oil Company Limited about sending a free sample of Gargoyle Hypoid Gear Lubricant for testing. | 13th Mar 1937 | Box 145 \ 1 scan0183 | |
| Circular letter detailing the use of Gargoyle Hypoid Gear Lubricant for new axle designs. | 1st Mar 1937 | Box 145 \ 1 scan0184 | |
| From Vacuum Oil Company regarding the application and approvals of Gargoyle Hypoid Gear Lubricant. | 1st Mar 1937 | Box 145 \ 1 scan0185 | |
| Letter from Vacuum Oil Company regarding propeller shaft lubrication and the Phantom III instruction book. | 22th Mar 1937 | Box 145 \ 1 scan0186 | |
| Letter to the Vacuum Oil Company regarding the type of grease used for propeller shaft sliding joints. | 23th Mar 1937 | Box 145 \ 1 scan0187 | |
| Dispatch and packing of a 500°C Rudge Unit and its associated spares. | 25th Mar 1937 | Box 145 \ 1 scan0188 | |
| Requesting the repair and return of Pressure Gauge No. 72420. | 31th Mar 1937 | Box 145 \ 1 scan0189 | |
| The despatch of a Phantom III engine oil filter unit. | 14th Apr 1937 | Box 145 \ 1 scan0190 | |
| Letter to the Vacuum Oil Company requesting an opinion on silt found in an oil filter from a Phantom III car. | 14th Apr 1937 | Box 145 \ 1 scan0191 | |
| Letter from Vacuum Oil Company regarding the examination of a filter and enquiring about the use of leaded-fuel. | 15th Apr 1937 | Box 145 \ 1 scan0192 | |
| Request to install and wire up a charging and starting panel for No. 2c Bed. | 15th Apr 1937 | Box 145 \ 1 scan0193 | |
| Letter to the Vacuum Oil Company clarifying that a car's oil filter came from a vehicle that always used 'Ethyl' fuel. | 16th Apr 1937 | Box 145 \ 1 scan0194 | |
| Letter from Vacuum Oil Company providing seizing temperature figures for various grades of Mobiloil. | 20th Apr 1938 | Box 145 \ 1 scan0195 | |
| Letter discussing the analysis of a failed engine oil filter, its deposits, and potential causes for its collapse. | 27th Apr 1937 | Box 145 \ 1 scan0196 | |
| Letter confirming the use of leaded-fuel in a specific case. | 22th May 1937 | Box 145 \ 1 scan0197 | |
| Letter from the Vacuum Oil Company regarding the unsuitability of a back axle lubricant and the provision of an alternative oil for testing. | 22th May 1937 | Box 145 \ 1 scan0198 | |
| Letter to the Vacuum Oil Company Limited regarding the testing of a new 5-gallon drum of EP oil. | 26th May 1937 | Box 145 \ 1 scan0199 | |
| Letter from Vacuum Oil Company acknowledging receipt of a drum of Mobiloil 'EP' for testing and referencing an axle examination. | 27th May 1937 | Box 145 \ 1 scan0200 | |
| Letter to Mr Grylls requesting to arrange a visit to inspect a rear axle. | 7th Jun 1937 | Box 145 \ 1 scan0201 | |
| Letter closing signed by H Russell Sharp, with an additional note specifying a reply address for the Vacuum Oil Co Ltd. | 8th Jun 1937 | Box 145 \ 1 scan0202 | |
| Letter to The Vacuum Oil Co. Ltd. regarding a sample of gearbox oil from an ongoing test. | 8th Jun 1937 | Box 145 \ 1 scan0203 | |
| Letter discussing unsatisfactory test results of a Mobiloil EP sample, showing rusting on a steel bush and puzzling corrosion results. | 14th Jun 1937 | Box 145 \ 1 scan0204 | |
| Letter from Vacuum Oil Company regarding the return of various used and unused oil drums for testing purposes. | 16th Jun 1937 | Box 145 \ 1 scan0205 | |
| The return of Vacuum EP oils and the retention of one gallon for a dynamometer test. | 17th Jun 1937 | Box 145 \ 1 scan0206 | |
| The dispatch of Hypoid and E.P. gear oil and its subsequent return to the Vacuum Oil Co. Ltd. | 19th Jun 1937 | Box 145 \ 1 scan0207 | |
| Letter to O.T. Jones of Vacuum Oil Co. Ltd. regarding the return of oil consignments and testing of a new sample. | 19th Jun 1937 | Box 145 \ 1 scan0208 | |
| Letter from the Vacuum Oil Company regarding the testing and analysis of hypoid gear oils. | 21th Jun 1937 | Box 145 \ 1 scan0209 | |
| Telegram confirming the arrival of two gallons of Vacuum oil in Derby. | 24th Jun 1937 | Box 145 \ 1 scan0210 | |
| Telegram requesting an urgent supply of one gallon of Hypoid Lubricant. | 24th Jun 1937 | Box 145 \ 1 scan0211 | |
| Telegram received by telephone regarding two gallons of oil arriving in Derby. | 24th Jun 1937 | Box 145 \ 1 scan0212 | |
| Letter from the Vacuum Oil Company confirming the dispatch of Gargoyle Hypoid Gear Lubricant. | 24th Jun 1937 | Box 145 \ 1 scan0213 | |
| Confirmation of a telegram from the Vacuum Oil Company regarding an oil delivery. | 24th Jun 1937 | Box 145 \ 1 scan0214 | |
| Letter from Vacuum Oil Company Limited reporting on Mobiloil 'EP' test results. | 5th Jul 1937 | Box 145 \ 1 scan0215 | |
| Analysis of material deposits on a returned steel bush and a discussion of related testing procedures. | 13th Jul 1937 | Box 145 \ 1 scan0216 | |
| Letter from Vacuum Oil Company regarding the dispatch of a 5-gallon drum of Gargoyle Hypoid Gear Lubricant to France. | 13th Jul 1937 | Box 145 \ 1 scan0217 | |
| Letter to the Vacuum Oil Company enquiring about oil testing and gear lubricant recommendations. | 3rd Aug 1937 | Box 145 \ 1 scan0218 | |
| Letter from the Vacuum Oil Company Limited discussing the arrangements for an oil lubricant test on a Cornell Machine. | 4th Aug 1937 | Box 145 \ 1 scan0219 | |
| Letter from Vacuum Oil Company Limited regarding Gargoyle Hypoid Gear Lubricant and transmission lubrication recommendations. | 12th Aug 1937 | Box 145 \ 1 scan0220 | |
| Letter to the Vacuum Oil Company regarding the testing of two extreme pressure lubricant samples. | 12th Aug 1937 | Box 145 \ 1 scan0221 | |
| Request to despatch two 1-gallon tins of oil samples to O.T. Jones at Vacuum Oil Co. | 13th Aug 1937 | Box 145 \ 1 scan0222 | |
| Letter to the Packard Motor Car Company regarding lubricant issues with Hypoid Gears. | 31th Aug 1937 | Box 145 \ 1 scan0223 | |
| Letter to the Vacuum Oil Company regarding the testing of Hypoid gear lubricant samples. | 31th Aug 1937 | Box 145 \ 1 scan0224 | |
| The dispatch of a used gear oil sample from a 25/30 HP car to the Vacuum Oil Company. | 31th Aug 1937 | Box 145 \ 1 scan0225 | |
| Letter from Vacuum Oil Company acknowledging receipt of a used gear lubricant sample for laboratory testing. | 1st Sep 1937 | Box 145 \ 1 scan0226 | |
| Request to order two oil cans, a rubber air hose, and a pistol for 'No. 2. BED'. | 2nd Sep 1937 | Box 145 \ 1 scan0227 | |
| Letter from Vacuum Oil Company regarding test reports on two samples of Extreme Pressure Oil. | 10th Sep 1937 | Box 145 \ 1 scan0228 | |
| The concluding page of a letter to V.O.Co., Ltd. | 10th Sep 1937 | Box 145 \ 1 scan0229 | |
| Comparative analysis report for two samples, 'A' and 'B', detailing their physical and chemical properties. | 10th Sep 1937 | Box 145 \ 1 scan0230 | |
| Test report No.2 detailing measurements of torque, temperature, and wear over time at specific jaw loads. | 11th Sep 1937 | Box 145 \ 1 scan0231 | |
| Letter to the Vacuum Oil Company regarding test results for hypoid gear lubricant and its properties. | 11th Sep 1937 | Box 145 \ 1 scan0232 | |
| Letter from Mr. Grylls declining an invitation from the Vacuum Oil Company Ltd. | 15th Sep 1937 | Box 145 \ 1 scan0233 | |
| Letter from Vacuum Oil Company regarding the relative values of lubricants with and without sulphur. | 18th Sep 1937 | Box 145 \ 1 scan0234 | |
| Request to order a 50-gallon barrel of Mobiloil Artic for use on experimental cars. | 18th Sep 1937 | Box 145 \ 1 scan0235 | |
| Letter from Mr. W.A. Robotham regretting an invitation from the Vacuum Oil Company Ltd. | 20th Sep 1937 | Box 145 \ 1 scan0236 | |
| Letter to Vacuum Oil Co. Ltd. inquiring about the future availability of specific oil grades for instruction book updates. | 20th Sep 1937 | Box 145 \ 1 scan0237 | |
| Letter from the Vacuum Oil Company confirming oil types and pricing for the current year. | 22th Sep 1937 | Box 145 \ 1 scan0238 | |
| Letter from the Vacuum Oil Company detailing test results for various Hypoid Gear Lubricants. | 12th Oct 1937 | Box 145 \ 1 scan0239 | |
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