| Description | Date | Identifier | |
| Policy for advising customers on engine oil and lubricant mixing for chassis. | 29th Jun 1938 | Box 145 \ 3 scan0187 | |
| Confirming the acceptability of mixing recommended chassis lubricant oils. | 1st Jul 1938 | Box 145 \ 3 scan0188 | |
| Request to order Mobiloil Hypoid gear oil and Arctic oil for the experimental garage. | 1st Jul 1938 | Box 145 \ 3 scan0189 | |
| Confirming the circulation of documents regarding chassis lubricants. | 4th Jul 1938 | Box 145 \ 3 scan0190 | |
| To inspecting engineers about the interchangeability of recommended chassis lubricants for customers. | 4th Jul 1938 | Box 145 \ 3 scan0191 | |
| Sales letter to Bentley Motors regarding a Visco-Meter device for monitoring oil viscosity. | 27th Aug 1938 | Box 145 \ 3 scan0192 | |
| Promotional leaflet for the Visco-Meter, a device for testing oil viscosity. | 4th Oct 1938 | Box 145 \ 3 scan0193 | |
| Letter from Alexander Duckham & Co Ltd regarding the omission of their H.B.B. Grease from the 'Phantom III' instruction book. | 4th Oct 1938 | Box 145 \ 3 scan0194 | |
| Letter to Alexander Duckham & Co. Ltd. regarding a change in recommended lubricants. | 5th Oct 1938 | Box 145 \ 3 scan0195 | |
| Letter from Alexander Duckham & Co Ltd regarding their intention to create a grease to surpass Mobil No.2. | 10th Oct 1938 | Box 145 \ 3 scan0196 | |
| Letter to Alexander Duckham & Co. Ltd. detailing the required specifications for a chassis and hub grease. | 11th Oct 1938 | Box 145 \ 3 scan0197 | |
| Seeking views on a customer-supplied Macmillan motor oil for a decarbonisation service. | 17th Oct 1938 | Box 145 \ 3 scan0198 | |
| Company's stance on customers using non-recommended special oils, referencing Lady Sassoon's car. | 25th Oct 1938 | Box 145 \ 3 scan0199 | |
| Letter from Alexander Duckham & Co Ltd regarding the development of Chassis Greases. | 17th Nov 1938 | Box 145 \ 3 scan0200 | |
| Request for analysis of four oil samples from a 15,000-mile test on a Castrolite Oil Unit. | 21th Nov 1938 | Box 145 \ 3 scan0201 | |
| Letter to Alexander Duckham & Co. Ltd. regarding an issue with grease melting on brake expanders and requesting a suitable alternative. | 3rd Jan 1939 | Box 145 \ 3 scan0202 | |
| Letter from Alexander Duckham & Co Ltd regarding the recommendation and properties of K.G. 24 grease. | 7th Feb 1939 | Box 145 \ 3 scan0203 | |
| Chart detailing the properties and applications of various types of grease. | 7th Feb 1939 | Box 145 \ 3 scan0204 | |
| Requesting the arrangement of engine oil tests with the Vacuum Oil Co. to check for loss of lubricating power. | 10th Feb 1939 | Box 145 \ 3 scan0205 | |
| Letter from Alexander Duckham & Co Ltd confirming an amended order for two types of grease, providing melting points and pricing. | 22th Aug 1939 | Box 145 \ 3 scan0206 | |
| Requesting an order of various engine and axle oils to be stocked at Shardlow. | 1st Nov 1939 | Box 145 \ 3 scan0207 | |
| Recommended lubricating oils for the long-term storage of cars to prevent corrosion. | 17th Jan 1940 | Box 145 \ 3 scan0208 | |
| Use of Hi-Press rear axle oil for specific vehicles. | 18th Jan 1940 | Box 145 \ 3 scan0209 | |
| The use of mineral oils for the storage of cars. | 20th Jan 1940 | Box 145 \ 3 scan0210 | |
| Request for information on customer cars running on thin oils in London traffic conditions. | 24th Feb 1940 | Box 145 \ 3 scan0211 | |
| Wear on the bronze magneto drive skew gear for the Merlin engine and recommending anti-wear running-in procedures. | 28th Oct 1940 | Box 145 \ 3 scan0212 | |
| Appropriate type of Extreme Pressure (E.P.) oil for running-in gearboxes and gears. | 31th Oct 1940 | Box 145 \ 3 scan0213 | |
| Bearing failures caused by using thin oils and the importance of cleaning suction strainers. | 12th Dec 1940 | Box 145 \ 3 scan0214 | |
| Use of doped oils and the process of chromium plating rockers on engines. | 23th Jun 1941 | Box 145 \ 3 scan0215 | |
| Letter from Shell-Mex and B.P. Ltd regarding the supply of AeroShell Oil to service depots and fuel research. | 1st May 1934 | Box 145 \ 3 scan0216 | |
| Continuation sheet of a letter from Shell-Mex and B.P. Limited regarding confidential observations. | 1st May 1934 | Box 145 \ 3 scan0217 | |
| Letter to Shell Mex & B.P. Ltd. regarding oil stocking policy at service depots and a request for test results on inlet mixture temperatures. | 2nd May 1934 | Box 145 \ 3 scan0218 | |
| Letter from Shell-Mex and B.P. Ltd regarding lubricating oil and methods for correlating anti-knock test results with on-road engine temperature readings. | 4th May 1934 | Box 145 \ 3 scan0219 | |
| Letter from Shell-Mex and B.P. Limited concerning the cooling effects of alcohol-fuel mixtures. | 4th May 1934 | Box 145 \ 3 scan0220 | |
| Letter sent to Shell-Mex & B.P. Ltd. about a suggestion to stock Aero Shell oil. | 14th May 1934 | Box 145 \ 3 scan0221 | |
| Letter to Shell-Mex & B.P. Ltd. declining to stock Aero Shell oil due to insignificant demand. | 14th May 1934 | Box 145 \ 3 scan0222 | |
| Letter from an oil supplier discussing the performance and corrosion risks of Extreme Pressure lubricants. | 31th Jul 1934 | Box 145 \ 3 scan0223 | |
| Letter from Shell-Mex and B.P. Ltd. requesting data on tooth pressures for their E.P. Lubricant testing. | 31th Jul 1934 | Box 145 \ 3 scan0224 | |
| Letter to Shell-Mex & B.P. Ltd. concerning issues with E.P. lubricants settling when stored. | 27th Aug 1934 | Box 145 \ 3 scan0225 | |
| Letter to Shell-Mex & B.P. Ltd. detailing requirements for extreme pressure lubricants for gearboxes and issues with carbon deposits on ball bearings. | 28th Aug 1934 | Box 145 \ 3 scan0226 | |
| Letter from Shell-Mex and B.P. Ltd. acknowledging a letter regarding information on tooth pressures. | 29th Aug 1934 | Box 145 \ 3 scan0227 | |
| Letter to Shell-Mex Ltd. requesting recommendations for a thinner grade of winter oil. | 8th Oct 1934 | Box 145 \ 3 scan0228 | |
| Follow-up letter to Shell-Mex Ltd. regarding a previous inquiry about a thinner grade of oil for winter use. | 25th Oct 1934 | Box 145 \ 3 scan0229 | |
| Letter from Shell-Mex and B.P. Ltd. regarding a previous correspondence that went astray and attaching a copy. | 26th Oct 1934 | Box 145 \ 3 scan0230 | |
| Letter from Shell-Mex and B.P. Ltd. detailing the viscosity characteristics of their standard Double Shell Motor Oil. | 10th Oct 1934 | Box 145 \ 3 scan0231 | |
| Letter from Shell-Mex regarding the approval of Spirax axle lubrication for inclusion in instruction books. | 29th Oct 1935 | Box 145 \ 3 scan0232 | |
| Letter to Shell-Mex & B.P. Ltd. commenting on the heavy viscosity of a recommended oil. | 30th Oct 1934 | Box 145 \ 3 scan0233 | |
| Letter from Shell-Mex and B.P. Ltd discussing the suitability of Double Shell and Single Shell motor oils for cold starting. | 7th Nov 1934 | Box 145 \ 3 scan0234 | |
| Letter responding to an enquiry about an E.P. lubricant, explaining why it has not been tested or recommended. | 13th Nov 1935 | Box 145 \ 3 scan0235 | |
| Letter from Shell-Mex House to W. A. Robotham regarding the road testing of an E.P. lubricant. | 18th Nov 1935 | Box 145 \ 3 scan0236 | |
| Requesting an opinion on a list of Shell-recommended lubricants for various car parts. | 11th Dec 1936 | Box 145 \ 3 scan0237 | |
| Letter from the Experimental Department to Shell-Mex and B.P. Ltd. regarding lubricant samples and octane ratings. | 11th Dec 1936 | Box 145 \ 3 scan0238 | |
| Letter from Shell seeking assurance on the suitability of their reformed petrol for Rolls-Royce and Bentley engines. | 10th May 1937 | Box 145 \ 3 scan0239 | |
| Letter from Shell advising of an improvement to the anti-knock quality of their standard petrol. | 1st Mar 1937 | Box 145 \ 3 scan0240 | |
| Letter to L.G. Callingham of Shell-Mex House regarding upcoming tests on new Shell fuel. | 19th May 1937 | Box 145 \ 3 scan0241 | |
| Letter from Shell-Mex and B.P. Ltd discussing reformed 'Shell' fuel and a new range of motor oils. | 28th May 1937 | Box 145 \ 3 scan0242 | |
| Letter from Shell-Mex and B.P. Ltd regarding the testing and recommendation of new motor oil grades. | 28th May 1937 | Box 145 \ 3 scan0243 | |
| Letter from Shell-Mex and B.P. Limited proposing collaborative testing of new oils and fuels in a 4 1/4 litre Bentley. | 28th May 1937 | Box 145 \ 3 scan0244 | |
| Letter from Shell-Mex and B.P. Limited regarding research work and a new all-season oil. | 28th May 1937 | Box 145 \ 3 scan0245 | |
| Comparison table for 'Light' and 'Heavy' oils, detailing specific gravity, viscosity at various temperatures, and cold starting times. | 31th May 1937 | Box 145 \ 3 scan0246 | |
| Sale of cars to Shell-Mex & B.P. Ltd. for oil testing. | 31th May 1937 | Box 145 \ 3 scan0247 | |
| The sale of cars to Shell-Mex & B.P. Ltd. for oil testing purposes. | 31th May 1937 | Box 145 \ 3 scan0248 | |
| Letter to Shell-Mex & B.P. Ltd. discussing the testing of new oils in a cold chamber and declining a proposal for car-based oil tests. | 4th Jun 1937 | Box 145 \ 3 scan0249 | |
| Letter from Shell-Mex and B.P. Ltd confirming the dispatch of four different grades of oil for testing. | 10th Jun 1937 | Box 145 \ 3 scan0250 | |
| Letter to L.G. Callingham of Shell-Mex and B.P. Ltd. regarding figures for Lucas' Cold Chamber. | 15th Jun 1937 | Box 145 \ 3 scan0251 | |
| Conversation about Shell oils and their inclusion in the Instruction Book. | 1st Jul 1937 | Box 145 \ 3 scan0252 | |
| Letter from Shell-Mex House to W. A. Robotham regarding tests on new oils and the suitability of Shell fuel for Rolls Royce and Bentley cars. | 1st Jul 1937 | Box 145 \ 3 scan0253 | |
| Extract from a report on the comparative cold testing of oils. | 18th Feb 1937 | Box 145 \ 3 scan0254 | |
| Observations and conclusions from tests comparing old and new ranges of engine oils based on dilution, cranking speeds and startability. | 18th Feb 1937 | Box 145 \ 3 scan0255 | |
| Comparison of engine start times and torques using old and new ranges of oil under hot and cold conditions. | 18th Feb 1937 | Box 145 \ 3 scan0256 | |
| Study on engine cranking resistance, 'break-away torque', and the behavior of different oils at various temperatures. | 18th Feb 1937 | Box 145 \ 3 scan0257 | |
| The viscosity values and dilution of eight different grades of Shell oil. | 16th Jul 1937 | Box 145 \ 3 scan0258 | |
| Letter to Shell-Mex House regarding the performance and suitability of Reformed Shell petrol in their vehicles. | 16th Jul 1937 | Box 145 \ 3 scan0259 | |
| Letter from Shell-Mex House regarding the suitability and gum content of Shell fuel for Rolls Royce and Bentley cars. | 19th Jul 1937 | Box 145 \ 3 scan0260 | |
| Query and experience regarding the use of Reformed Shell fuel in Trials cars compared to Ethyl fuel. | 23th Jul 1937 | Box 145 \ 3 scan0261 | |
| Confirming the satisfactory use of Shell spirit for Trials Cars. | 27th Jul 1937 | Box 145 \ 3 scan0262 | |
| Letter from Shell-Mex House regarding the urgent confirmation needed for literature on new motor oils for the upcoming Motor Show. | 7th Sep 1937 | Box 145 \ 3 scan0263 | |
| Letter from Shell-Mex and B.P. Ltd regarding the introduction of new motor oils and their use in vehicles. | 7th Sep 1937 | Box 145 \ 3 scan0264 | |
| Letter from Shell-Mex and B.P. Ltd. seeking approval for their new oil recommendations for winter and summer use. | 7th Sep 1937 | Box 145 \ 3 scan0265 | |
| Letter from Shell-Mex and B.P. Ltd. detailing the S.A.E. numbers for their new oils. | 9th Sep 1937 | Box 145 \ 3 scan0266 | |
| Letter to Shell-Mex & B.P. Ltd. requesting the S.A.E. equivalent of their new oils for an instruction book update. | 8th Sep 1937 | Box 145 \ 3 scan0267 | |
| Letter to Shell-Mex regarding changes to oil recommendations in instruction books. | 24th Sep 1937 | Box 145 \ 3 scan0268 | |
| Letter from Shell-Mex and B.P. Ltd discussing oil grades and the anti-knock properties of different petrols. | 7th Oct 1937 | Box 145 \ 3 scan0269 | |
| Letter from Shell-Mex and B.P. Ltd. offering private information on combined fuel road tests. | 7th Oct 1937 | Box 145 \ 3 scan0270 | |
| Letter advising against using petrol containing alcohol in 3½ and 4½ Litre Bentley cars due to potential damage to the petrol pump diaphragms. | 6th Aug 1937 | Box 145 \ 3 scan0271 | |
| Letter to Shell-Mex & B.P. Ltd. discussing the performance of National Benzole Mixture. | 9th Oct 1937 | Box 145 \ 3 scan0272 | |
| Letter to an oil company regarding the alteration of oil viscosities and a proposal to include S.A.E. numbers in instruction books. | 9th Mar 1938 | Box 145 \ 3 scan0273 | |
| Letter from Shell-Mex and B.P. Ltd suggesting a meeting to discuss lubricating oil recommendations. | 14th Mar 1938 | Box 145 \ 3 scan0274 | |
| Letter to Messrs. Shell-Mex & B.P. Ltd. to arrange a meeting with Mr. Todd. | 15th Mar 1938 | Box 145 \ 3 scan0275 | |
| Letter from Shell-Mex and B.P. Ltd confirming the postponement of a meeting for Mr. Grylls. | 17th Mar 1938 | Box 145 \ 3 scan0276 | |
| Request from Shell Marketing Company's Film Unit to photograph a chassis with independent wheel suspension for an instructional film. | 31th Mar 1938 | Box 145 \ 3 scan0277 | |
| Letter from Shell-Mex and B.P. Ltd regarding the marking of oil packages. | 1st Apr 1938 | Box 145 \ 3 scan0278 | |
| Letter to Shell Marketing Company's Film Unit regarding a request to visit the Works. | 4th Apr 1938 | Box 145 \ 3 scan0279 | |
| Letter from Shell-Mex discussing gearbox oil markings, viscosity ratings and a future meeting. | 5th Apr 1938 | Box 145 \ 3 scan0280 | |
| Letter from Shell-Mex and B.P. Ltd discussing the marking of lubricating oils for Rolls-Royce and Bentley vehicles. | 5th Apr 1938 | Box 145 \ 3 scan0281 | |
| Letter from Shell-Mex and B.P. Limited discussing oil specifications and the marking of oil grades for gearboxes. | 5th Apr 1938 | Box 145 \ 3 scan0282 | |
| Letter from Shell-Mex and B.P. Limited with lubricating oil recommendations for various vehicle components. | 5th Apr 1938 | Box 145 \ 3 scan0283 | |
| Letter to Shell-Mex & B.P. Ltd. concerning gearbox oil specifications and the absence of Mr. Grylls. | 12th Apr 1938 | Box 145 \ 3 scan0284 | |
| Letter from Shell-Mex and B.P. Ltd to arrange a meeting regarding oil recommendations with Mr. Grylls. | 13th Apr 1938 | Box 145 \ 3 scan0285 | |
| Letter to Shell-Mex & B.P. Ltd. regarding lubricant and oil recommendations for various vehicle components. | 28th Apr 1938 | Box 145 \ 3 scan0286 | |
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