| Description | Date | Identifier | |
| Letter from Tide Water Oil Sales Corporation regarding Veedol oils and enclosed specifications. | 2nd Sep 1924 | Box 32 \ 4 Scan175 | |
| Laboratory report comparing the properties and test results of various oils. | 1st Oct 1924 | Box 32 \ 4 Scan176 | |
| Update on actions being taken to resolve issues with lubricating oils. | 1st Oct 1924 | Box 32 \ 4 Scan177 | |
| Chasing a reply to a previous query about lubricating oils. | 14th Oct 1924 | Box 32 \ 4 Scan178 | |
| Issues with stiff steering and faulty gearboxes on cars left standing, proposing a change from compounded oil to pure mineral oil. | 29th Sep 1924 | Box 32 \ 4 Scan179 | |
| Page 2 of instructions for vehicle maintenance, specifically jacking up wheels and tracking completion. | 14th Oct 1924 | Box 32 \ 4 Scan180 | |
| Letter from Mineral Oil Products Ltd. following up on communications regarding lubricating oils for cars and aeroplanes. | 14th Oct 1924 | Box 32 \ 4 Scan181 | |
| Page 2 of a letter from British Mineral Oil Products Limited requesting a meeting regarding VEEDOL lubricants. | 17th Oct 1924 | Box 32 \ 4 Scan182 | |
| Letter declining to test new lubricating oil samples as the company is satisfied with the current ones. | 17th Oct 1924 | Box 32 \ 4 Scan183 | |
| Responding to complaints by confirming gearbox and axle oils are pure mineral oils, not compound oils. | 7th Oct 1924 | Box 32 \ 4 Scan184 | |
| Recommendations for lubricating and periodically turning over engines for cars standing at coachbuilders. | 20th Oct 1924 | Box 32 \ 4 Scan185 | |
| Letter concerning lubricant arrangements and the global use of Veedol oil for cars and aeroplane engines. | 20th Oct 1924 | Box 32 \ 4 Scan186 | |
| Letter from British Mineral Oil Products Ltd proposing a trial for their aeroplane engine lubricants. | 28th Nov 1924 | Box 32 \ 4 Scan187 | |
| The delivery of four one-gallon tins of Caspar Oil to the stores. | 28th Nov 1924 | Box 32 \ 4 Scan188 | |
| Persistent customer, Mr. E.S. Prather, and his interest in Caspar Oil for chassis 59.LM. | 29th Sep 1924 | Box 32 \ 4 Scan189 | |
| Letter declining an offer to test Castor Oil for Chassis No. 59.LM due to other ongoing experiments. | 24th Sep 1924 | Box 32 \ 4 Scan190 | |
| Letter from E. S. Prather discussing the properties and blending process of Caspar Oil compared to Castrol. | 26th Sep 1924 | Box 32 \ 4 Scan191 | |
| Letter from Marmon Automobile Company to a customer recommending the use of Caspar Oil. | 6th May 1924 | Box 32 \ 4 Scan192 | |
| Testimonial letter from Marmon Automobile Company regarding their experience with Caspar Oil. | 22th Nov 1923 | Box 32 \ 4 Scan193 | |
| Lab report on Caspar Oil following a one-hundred-hour non-stop motor run. | 22th Nov 1923 | Box 32 \ 4 Scan194 | |
| Test report from the New York Testing Laboratories summarizing the performance of Caspor Oil. | 22th Nov 1923 | Box 32 \ 4 Scan195 | |
| Technical paper discussing the benefits of blending castor oil with mineral oil to reduce crankcase dilution and contamination. | 29th Dec 1924 | Box 32 \ 4 Scan196 | |
| Use and testing of mineral oil in cars to prevent rusting and engine issues. | 29th Dec 1924 | Box 32 \ 4 Scan197 | |
| Use of Prices' engine oil and potential alternatives, noting the composition of compounded oil. | 29th Dec 1924 | Box 32 \ 4 Scan198 | |
| The use of mineral oil versus standard compound oil, investigating its effect on piston squeaks in the 20 HP model. | 30th Dec 1924 | Box 32 \ 4 Scan199 | |
| Page 2 of a report comparing oil properties and providing recommendations on oil sourcing and fault handling. | 27th Jan 1925 | Box 32 \ 4 Scan200 | |
| Request to obtain viscosity curves for various oils at specified temperatures. | 27th Jan 1925 | Box 32 \ 4 Scan201 | |
| Letter from Alexander Duckham & Co. Ltd requesting the results of trials for their new Adcol Process Motor Oil. | 2nd Feb 1925 | Box 32 \ 4 Scan202 | |
| Communication quoting an offer from Frank How & Company for a new, cheaper Aero Engine Oil and suggesting a trial. | 2nd Feb 1925 | Box 32 \ 4 Scan203 | |
| Letter to Alexander Duckham Ltd. regarding the results of tests on their Adcol New Process Motor Oil. | 9th Feb 1925 | Box 32 \ 4 Scan204 | |
| Letter from Alexander Duckham & Co. Ltd regarding trials of their Adcol New Process Motor Oil. | 11th Feb 1925 | Box 32 \ 4 Scan205 | |
| The use and availability of Toneline oil for Chassis 67-UE. | 29th Apr 1925 | Box 32 \ 4 Scan206 | |
| To a customer regarding the testing and approval of a new brand of oil he wishes to use. | 17th Jun 1925 | Box 32 \ 4 Scan207 | |
| Letter regarding Caspar Oil and a Mr. E.S. Prather, enclosing a reply and requesting comments. | 15th Jul 1925 | Box 32 \ 4 Scan208 | |
| Letter from Elmer S. Prather encouraging the testing of Caspar Oil and detailing its positive performance. | 13th Jul 1925 | Box 32 \ 4 Scan209 | |
| Requesting the dispatch of two different types of oil as per Mr. Royce's wishes. | 28th Aug 1925 | Box 32 \ 4 Scan210 | |
| Requesting the despatch of two types of oil to Mr. Royce for experimental purposes. | 1st Sep 1925 | Box 32 \ 4 Scan211 | |
| Suitability of Adcol Oil for Chassis 57-RC. | 25th Sep 1925 | Box 32 \ 4 Scan212 | |
| Issue of oil dilution with petrol in cold climates and the proposed scheme to trap it. | 13th Oct 1925 | Box 32 \ 4 Scan213 | |
| Query regarding a customer's views on Super-Shell Lubricating Oil for 'Silver Ghost' engines. | 20th Oct 1925 | Box 32 \ 4 Scan214 | |
| Examination and testing of Shell super light racing oil compared to other compound oils. | 24th Oct 1925 | Box 32 \ 4 Scan215 | |
| Testing super-Shell lubricating oil, detailing its efficiency and effect on engine noise. | 24th Oct 1925 | Box 32 \ 4 Scan216 | |
| Examination of Caspar Oil in chassis 59-LM after extended use. | 26th Oct 1925 | Box 32 \ 4 Scan217 | |
| Official consent for customers to use Duckhams Engine Oil. | 28th Dec 1925 | Box 32 \ 4 Scan218 | |
| Laboratory report on the properties of a treated castor oil sample used by the R.A.F., comparing it to a previous sample. | 7th Jan 1925 | Box 32 \ 4 Scan219 | |
| Forwarding a proposal from British Mineral Oil Products Ltd. for their oil to be tested and recommended. | 19th Jan 1926 | Box 32 \ 4 Scan220 | |
| Letter from the American Chief Engineer to Derby regarding Veedol engine oil. | 29th Aug 1924 | Box 32 \ 4 Scan221 | |
| The rejection of Veedol oil based on its composition and Mr. Royce's preference for a compound oil. | 25th Jan 1926 | Box 32 \ 4 Scan222 | |
| The use of 'Veedol' straight mineral oil by an American company. | 29th Jan 1926 | Box 32 \ 4 Scan223 | |
| Alternative oils to 'Veedol' and the suitability of compound versus mineral oils for the American market. | 30th Jan 1926 | Box 32 \ 4 Scan224 | |
| Covering memo from BJ to Hs enclosing correspondence regarding 'VEEDOL' oil. | 2nd Feb 1926 | Box 32 \ 4 Scan225 | |
| Letter inquiring if permission was granted to Veedol to reproduce a private internal letter for a booklet. | 23th Dec 1925 | Box 32 \ 4 Scan226 | |
| Letter concerning the unauthorized reproduction and alteration of a personal letter by the Veedol Oil company in a booklet. | 19th Jan 1926 | Box 32 \ 4 Scan227 | |
| Letter concerning the unauthorized publication of correspondence in a 'Veedol' booklet. | 22th Feb 1926 | Box 32 \ 4 Scan228 | |
| Pamphlet from Alex. Duckham & Co. Ltd. on their 'ADCOL NEW PROCESS MOTOR OILS'. | 23th Feb 1926 | Box 32 \ 4 Scan229 | |
| Suitability of Duckhams Adcol oil compared to the recommended Prices compound oil. | 2nd Feb 1926 | Box 32 \ 4 Scan230 | |
| Recommending not to investigate an oil from Three Arrow Oil Co Ltd as the claims for it are unreasonable. | 23th Mar 1926 | Box 32 \ 4 Scan231 | |
| Selection and testing of oils for car and aero engines. | 30th Mar 1926 | Box 32 \ 4 Scan232 | |
| Continued note to the Air Ministry regarding the consideration of oil suppliers. | 7th Apr 1926 | Box 32 \ 4 Scan233 | |
| Shell-de-Luxe lubricating oil and a suggested third alternative. | 7th Apr 1926 | Box 32 \ 4 Scan234 | |
| Letter discussing customer claims about improved engine performance using 'Shell-De-luxe' lubricating oil and requesting an examination. | 22th Feb 1926 | Box 32 \ 4 Scan235 | |
| Suitability of Shell-de-Luxe and Shell super-light engine oils. | 12th Apr 1926 | Box 32 \ 4 Scan236 | |
| Recommendation of Shell-de-Luxe lubricating oil. | 13th Apr 1926 | Box 32 \ 4 Scan237 | |
| Use, recommendation and commercial arrangement for Tonneline lubricating oil. | 5th May 1926 | Box 32 \ 4 Scan238 | |
| Continued memo from B.J. to Hs. describing a valued customer who doesn't request discounts. | 1st May 1926 | Box 32 \ 4 Scan239 | |
| Requesting a reply to a previous communication about lubricating oil for cars. | 6th May 1926 | Box 32 \ 4 Scan240 | |
| Confirming the satisfactory performance and continued recommendation of Toneline lubricating oil. | 8th May 1926 | Box 32 \ 4 Scan241 | |
| Standardisation of Wakefield's XL lubricating oil as an alternative to Prices. | 12th May 1926 | Box 32 \ 4 Scan242 | |
| Omission of 'Toneline' lubricating oils for France from Instruction Sheet No 521. | 10th Apr 1926 | Box 32 \ 4 Scan243 | |
| From BJ to Hs. concerning correspondence with Sterns Ltd. and its enclosures. | 22th Jun 1926 | Box 32 \ 4 Scan244 | |
| Letter to Messrs. Sterns Ltd. acknowledging their letter and referring the matter to engineers. | 21th Jun 1926 | Box 32 \ 4 Scan245 | |
| Letter from Sterns Ltd. detailing the physical test results of their lubricating oils for winter and summer. | 17th Jun 1926 | Box 32 \ 4 Scan246 | |
| Letter from petroleum refiners Sterns Ltd. regarding the submission of free testing samples. | 11th Jun 1926 | Box 32 \ 4 Scan247 | |
| Letter to an oil manufacturer requesting the oil's specification instead of a sample for testing. | 11th Jun 1926 | Box 32 \ 4 Scan248 | |
| Letter from Sterns Ltd. requesting their 'STERNOL WW OIL' be tested for inclusion on the approved list of lubricants. | 9th Jun 1926 | Box 32 \ 4 Scan249 | |
| Letter to Sterns Ltd. requesting details about their Sternol oil, its composition, cold test setting point, and distributors. | 22th Jun 1926 | Box 32 \ 4 Scan250 | |
| Letter from Sterns Ltd. to Rolls-Royce acknowledging their correspondence and advising of a delay. | 16th Jul 1926 | Box 32 \ 4 Scan251 | |
| Follow-up letter from Shell-Mex Limited regarding the global availability of their motor oils. | 20th Aug 1926 | Box 32 \ 4 Scan252 | |
| Letter to Shell-Mex Ltd. declining to undertake tests on their oils. | 1st Sep 1926 | Box 32 \ 4 Scan253 | |
| Confirming the use of compressor oil for new shock dampers and sending a sample to the laboratory for analysis. | 15th Sep 1926 | Box 32 \ 4 Scan254 | |
| Laboratory report on the properties of a compressor oil sample, including specific gravity, flash point, acidity, and viscosity tests. | 22th Sep 1926 | Box 32 \ 4 Scan255 | |
| Letter to the Vacuum Oil Co. Ltd. requesting a recommendation for oil for a hydraulic damper. | 22th Sep 1926 | Box 32 \ 4 Scan256 | |
| Recommendation for shock damper oil for customer use in their hydraulic systems. | 27th Sep 1926 | Box 32 \ 4 Scan257 | |
| Recommendations for customers regarding the maintenance and refilling of hydraulic shock dampers. | 1st Oct 1926 | Box 32 \ 4 Scan258 | |
| Causes of gumming pistons, ranking various lubricating oils, and suggesting further tests. | 11th Oct 1926 | Box 32 \ 4 Scan259 | |
| Claim by Duckhams about their Adcol New Process 'RR' Oil and the decision on practical testing. | 28th Mar 1927 | Box 32 \ 4 Scan260 | |
| Test figures for Adcol New Process Oil 'RR', detailing viscosity, carbon, setting point, and flash point. | 28th Mar 1927 | Box 32 \ 4 Scan261 | |
| Recommendation for Castrol XL oil over Adcol lubricating oil for a 20 HP Chassis. | 23th May 1927 | Box 32 \ 4 Scan262 | |
| Tests on steering lubricants and the efficiency of various oils to prevent tightening up. | 27th Aug 1927 | Box 32 \ 4 Scan263 | |
| Summary of tests on the lubrication of a worm and nut steering mechanism using different oils. | 27th Aug 1927 | Box 32 \ 4 Scan264 | |
| Graph comparing the viscosity curves of different steering box oils at various temperatures. | 29th Aug 1927 | Box 32 \ 4 Scan265 | |
| Experiments on various lubricating oils for steering boxes, questioning the superior qualities of Price's Amber Gear oil. | 29th Aug 1927 | Box 32 \ 4 Scan266 | |
| Recommending the use of Amber A oil instead of Prices Motorine B.oil for the steering box. | 8th Sep 1927 | Box 32 \ 4 Scan267 | |
| Confirming the recommended oil for the Phantom steering box, with an alternative. | 10th Sep 1927 | Box 32 \ 4 Scan268 | |
| Letter to Messrs. Bentley & Coley regarding the principles and methods of lubrication. | 24th Oct 1927 | Box 32 \ 4 Scan269 | |
| Letter from F.H. Royce discussing lubrication methods for crane work and other slow-moving parts. | 25th Nov 1927 | Box 32 \ 4 Scan270 | |
| Recommendation of Shell oil for Phantom and 20 HP cars. | 25th Nov 1927 | Box 32 \ 4 Scan271 | |
| Properties and application of various lubrication oils and greases, focusing on mineral versus compound oils and their effects on ball bearings. | 12th Sep 1927 | Box 32 \ 4 Scan272 | |
| Lubricants for magnetos and an inquiry about the properties of liquid paraffin. | 12th Dec 1927 | Box 32 \ 4 Scan273 | |
| Properties and performance of different types of lubricating oils for engines. | 12th Dec 1927 | Box 32 \ 4 Scan274 | |
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