| Description | Date | Identifier | |
| Letter from C.C. Wakefield & Co. to the Experimental Department regarding a list of garages supplying CASTROL 'XL' motor oil. | 12th Jan 1926 | Box 32 \ 3 Scan090 | |
| List of garages in France stocking Castrol 'XL' motor oil. | 11th Jan 1926 | Box 32 \ 3 Scan091 | |
| Letter from C.C. Wakefield & Co. Ltd. concerning an amended list for obtaining supplies of Castrol 'XL' on the Riviera. | 20th Jan 1926 | Box 32 \ 3 Scan092 | |
| List of stockists for Castrol 'XL' motor oil in France. | 20th Jan 1926 | Box 32 \ 3 Scan093 | |
| Renewed request from Castrol to recommend their oil, referencing a past refusal and alleged use in company trials. | 27th Jan 1926 | Box 32 \ 3 Scan094 | |
| Letter from C.C. Wakefield & Co. Ltd. to E.W. Hives regarding an upcoming visit. | 27th Jan 1926 | Box 32 \ 3 Scan095 | |
| Testing and proposing the standardisation of Wakefields Castrol oil as an alternative to Prices oil due to better availability. | 29th Jan 1926 | Box 32 \ 3 Scan096 | |
| Urgent internal memo regarding the use of Castrol oil and a reply to Sir Charles Wakefield. | 30th Jan 1926 | Box 32 \ 3 Scan097 | |
| Letter to C.C. Wakefield & Co. Ltd. requesting gear oil samples for analysis and discussing oil specifications and usage. | 30th Jan 1926 | Box 32 \ 3 Scan098 | |
| Letter from C.C. Wakefield & Co. Ltd. arranging a meeting with Mr. Hives in Derby. | 1st Feb 1926 | Box 32 \ 3 Scan099 | |
| From CJ to Hs regarding Castrol, requesting a Standardisation Sheet and proposed wording for the Instruction Book. | 2nd Feb 1926 | Box 32 \ 3 Scan100 | |
| The availability of Castrol 'XL' Motor Oil in the French Riviera. | 3rd Feb 1926 | Box 32 \ 3 Scan101 | |
| List of garages in France stocking Castrol 'XL' Motor Oil. | 8th Jan 1926 | Box 32 \ 3 Scan102 | |
| Letter to C.C. Wakefield & Co. regarding the despatch of oil samples for analysis. | 4th Feb 1926 | Box 32 \ 3 Scan103 | |
| Complete analysis of Wakefields Castrol oil compared to Prices oil. | 1st Feb 1926 | Box 32 \ 3 Scan104 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding the international availability of CASTROL 'XL' motor oil. | 8th Feb 1926 | Box 32 \ 3 Scan105 | |
| Letter from C.C. Wakefield & Co. confirming receipt of gear oil samples for their research department. | 9th Feb 1926 | Box 32 \ 3 Scan106 | |
| Proposal to standardise the use of Wakefields lubricating oil as an alternative to Prices oil. | 2nd Feb 1926 | Box 32 \ 3 Scan107 | |
| List of garages in France that stock Castrol 'XL' Motor Oil. | 17th Nov 1926 | Box 32 \ 3 Scan108 | |
| Letter from C.C. Wakefield & Co. regarding the examination of gear oil samples and offering 'Castrol S' Gear Oil. | 17th Nov 1926 | Box 32 \ 3 Scan109 | |
| From CJ to Hs. about a laboratory report regarding the analysis of Wakefields and Prices oils. | 1st Feb 1926 | Box 32 \ 3 Scan110 | |
| Chasing a delayed laboratory report on Wakefield and Prices oils. | 1st Feb 1926 | Box 32 \ 3 Scan111 | |
| Letter to Wakefield & Co. Ltd. enclosing a chemist's report on 'XL' oil compared with Prices 'C', requesting comments. | 24th Feb 1926 | Box 32 \ 3 Scan112 | |
| The examination and composition of two oil samples, labelled 'A' and 'B'. | 22th Feb 1926 | Box 32 \ 3 Scan113 | |
| Comparative tests on two oil samples examining viscosity and separation of asphaltic bodies after heating. | 25th Feb 1926 | Box 32 \ 3 Scan114 | |
| Letter from C.C. Wakefield & Co. Ltd. acknowledging a communication and advising of a delay in response pending the return of their Chief Chemist. | 25th Feb 1926 | Box 32 \ 3 Scan115 | |
| Laboratory report on Wakefields 'XL' oil, indicating further tests are required. | 1st Mar 1926 | Box 32 \ 3 Scan116 | |
| Laboratory report on a sample of Castrol 'S' Gear Oil regarding its acid content and viscosity. | 1st Mar 1926 | Box 32 \ 3 Scan117 | |
| Letter from C.C. Wakefield & Co. Limited (Castrol) arranging a meeting with Mr. E.W. Hives. | 2nd Mar 1926 | Box 32 \ 3 Scan118 | |
| Standardisation of Wakefield's Oil and its inclusion in the Instruction Book. | 5th Mar 1926 | Box 32 \ 3 Scan119 | |
| Letter from lubricant manufacturer C.C. Wakefield & Co. discussing oil analysis results for Motorine C and Castrol XL. | 10th Mar 1926 | Box 32 \ 3 Scan120 | |
| Letter from C.C. Wakefield & Co. disagreeing with a report on the effect of fatty oil content on oil oxidation. | 10th Mar 1926 | Box 32 \ 3 Scan121 | |
| Critique of a report on oils A & B submitted by the London, Midland and Scottish Railway Co's Laboratory. | 15th Mar 1926 | Box 32 \ 3 Scan122 | |
| Tests and recommendations for alternative lubrication oils to 'Prices' oil, which is hard to obtain on the Continent. | 16th Mar 1926 | Box 32 \ 3 Scan123 | |
| Comparing the quality, corporate history, and distribution of Wakefields, Prices, and Vacuum oils. | 22th Feb 1926 | Box 32 \ 3 Scan124 | |
| Report from the London Midland & Scottish Railway Co. on the examination of two oil samples, 'A' and 'B'. | 22th Feb 1926 | Box 32 \ 3 Scan125 | |
| Page 2 of an oil comparison report detailing a heat test on two samples, 'A' and 'B'. | 10th Mar 1926 | Box 32 \ 3 Scan126 | |
| Letter from C.C. Wakefield & Co. Ltd. disagreeing with a report on Motorine 'C' and Castrol 'XL' oils. | 10th Mar 1926 | Box 32 \ 3 Scan127 | |
| Report and criticism on the properties of two different types of oil, A and B. | 15th Mar 1926 | Box 32 \ 3 Scan128 | |
| From CJ to Hs enquiring about the status of Wakefields' 'XL' Oil. | 23th Mar 1926 | Box 32 \ 3 Scan129 | |
| The circulation of a report and standardisation sheet for Wakefields 'XL' OIL. | 23th Mar 1926 | Box 32 \ 3 Scan130 | |
| Letter from C.C. Wakefield & Co. Ltd. arranging a meeting with Mr. E.W. Hives. | 23th Mar 1926 | Box 32 \ 3 Scan131 | |
| Recommendations for wheel and tyre combinations, and the standardisation of oils. | 25th Mar 1926 | Box 32 \ 3 Scan132 | |
| Experimental tests on various tyre types, focusing on performance issues like high-speed wobbles, noise, and skidding. | 25th Mar 1926 | Box 32 \ 3 Scan133 | |
| Low-pressure tyres for the Phantom model and a note on oil alternatives. | 25th Mar 1926 | Box 32 \ 3 Scan134 | |
| Differences between Prices and Wakefields oils, their composition, and availability. | 27th Mar 1926 | Box 32 \ 3 Scan135 | |
| Request for technical details on the composition of 'XL' oil, specifically its fatty oil content, for comparison against 'Prices' oil. | 27th Mar 1926 | Box 32 \ 3 Scan136 | |
| Standardisation document for the use of Wakefields 'XL' oil as an alternative to Prices oil. | 16th Mar 1926 | Box 32 \ 3 Scan137 | |
| Alternative lubricating oils, their composition, and a proposal for testing. | 24th Mar 1926 | Box 32 \ 3 Scan138 | |
| Approval of car oils, suggesting carbonisation tests, and consulting Mr. Ricardo. | 30th Mar 1926 | Box 32 \ 3 Scan139 | |
| Letter from lubricant manufacturer C.C. Wakefield & Co. discussing the science of lubrication and specific oils. | 30th Mar 1926 | Box 32 \ 3 Scan140 | |
| Letter from C. C. Wakefield & Co. Ltd. discussing the friction-reducing properties of various oils and fatty oil additives. | 30th Mar 1926 | Box 32 \ 3 Scan141 | |
| Letter from the US to the UK office acknowledging receipt of a standardization sheet for Wakefield's 'XL' Oil. | 12th Apr 1926 | Box 32 \ 3 Scan142 | |
| Letter to Messrs. C.C.Wakefield requesting a light mineral oil for hydraulic shock absorbers that ceases to flow at -15°C. | 20th May 1926 | Box 32 \ 3 Scan143 | |
| Letter from C.C. Wakefield & Co. regarding an oil for a hydraulic shock absorber. | 21th May 1926 | Box 32 \ 3 Scan144 | |
| Letter to Wakefield & Co. Ltd. regarding a sample of light mineral oil that is too thin and requesting its viscosity curve. | 21th Jun 1926 | Box 32 \ 3 Scan145 | |
| Graph comparing the viscosity curves of supplied oil versus required oil using a Redwood Viscometer. | 23th Jun 1926 | Box 32 \ 3 Scan146 | |
| Letter from C.C. Wakefield & Co. regarding the introduction of Castrol oil in Paris. | 23th Jun 1926 | Box 32 \ 3 Scan147 | |
| Letter from C.C. Wakefield & Co. acknowledging receipt of a letter concerning Light Mineral Oil. | 23th Jun 1926 | Box 32 \ 3 Scan148 | |
| Letter to Wakefield & Co. Ltd. regarding the use of Toneline and Wakefield's oils at the Paris and French depots. | 25th Jun 1926 | Box 32 \ 3 Scan149 | |
| Letter from C.C. Wakefield & Co. regarding an oil viscosity curve and a sample for testing. | 30th Jun 1926 | Box 32 \ 3 Scan150 | |
| Letter to C.C. Wakefield regarding a sample of experimental oil for testing. | 1st Jul 1926 | Box 32 \ 3 Scan151 | |
| Letter from C.C. Wakefield & Co. Ltd confirming the dispatch of a 5-gallon drum of Special Elaulic Oil for testing purposes. | 3rd Jul 1926 | Box 32 \ 3 Scan152 | |
| Order for a 5-gallon drum of special Elaulic oil for experimental purposes. | 5th Jul 1926 | Box 32 \ 3 Scan153 | |
| Frothing trouble on the Condor IIIA No. 370 and arranging a visit from a chemist. | 14th Jul 1927 | Box 32 \ 3 Scan154 | |
| Letter to C.C. Wakefield & Co. regarding investigations into the frothing of castor and castrol oil. | 18th Jul 1927 | Box 32 \ 3 Scan155 | |
| Letter from C.C. Wakefield & Co. Ltd. arranging a meeting with Mr. Robotham. | 19th Jul 1927 | Box 32 \ 3 Scan156 | |
| Properties and performance of different lubricating oils, specifically comparing Mobile 'BB' with Motorine 'C'. | 8th Mar 1927 | Box 32 \ 3 Scan157 | |
| Steering box experiments and the properties of various lubricating oils. | 29th Aug 1927 | Box 32 \ 3 Scan158 | |
| Requesting a requisition for two barrels of Castrol 'R' Motor Oil. | 30th Aug 1927 | Box 32 \ 3 Scan159 | |
| Communication from C.C. Wakefield & Co. and improving procedures for goods received. | 19th Aug 1927 | Box 32 \ 3 Scan160 | |
| Manufacturing process sheet with handwritten notes regarding experimental purposes. | 19th Aug 1927 | Box 32 \ 3 Scan161 | |
| Letter from C. C. Wakefield & Co., Ltd. regarding the delivery of Castrol 'R' Motor Oil. | 18th Aug 1927 | Box 32 \ 3 Scan162 | |
| Correspondence from C.C. Wakefield & Co. Limited regarding a proposed meeting. | 9th Sep 1927 | Box 32 \ 3 Scan163 | |
| Choice of oils and lubrication procedures for the Bijur system. | 1st May 1929 | Box 32 \ 3 Scan164 | |
| Letter to C.C. Wakefield & Co. Ltd. regarding the unsuitability of Castrol 'R' oil for hypoid rear axles. | 19th Jul 1929 | Box 32 \ 3 Scan165 | |
| Letter from C.C. Wakefield & Co. regarding the testing and supply of lubricants for Hypoid gears and central chassis lubrication. | 15th Aug 1929 | Box 32 \ 3 Scan166 | |
| Requesting an analysis of two oil samples for hypoid gears, Whitmore's and Wakefield's. | 23th Aug 1929 | Box 32 \ 3 Scan167 | |
| Letter to C.C. Wakefield & Co. Ltd. regarding the failure of their 'Wakefield' Gear Compound during a dynamometer test. | 23th Aug 1929 | Box 32 \ 3 Scan168 | |
| Page 2 of a letter regarding the approval of an oil for hypoid bevel gears by the Gleason Co. | 23th Aug 1929 | Box 32 \ 3 Scan169 | |
| Suitable lubricating oil for hypoid rear axles, detailing successful and failed tests. | 23th Aug 1929 | Box 32 \ 3 Scan170 | |
| Letter from C.C. Wakefield & Co. to Mr. Hives arranging a meeting in Derby. | 11th Nov 1929 | Box 32 \ 3 Scan171 | |
| Letter to C.C. Wakefield & Co. Ltd. arranging a visit to the Works for a Friday. | 18th Nov 1929 | Box 32 \ 3 Scan172 | |
| Letter from C.C. Wakefield & Co. Ltd confirming a change of meeting date. | 19th Nov 1929 | Box 32 \ 3 Scan173 | |
| Letter from C.C. Wakefield & Co. arranging a meeting with their Chief Chemist. | 16th Nov 1929 | Box 32 \ 3 Scan174 | |
| Comparative laboratory and aging tests on oils for hypoid rear axles from different suppliers. | 16th Jan 1930 | Box 32 \ 3 Scan175 | |
| Letter to C.C. Wakefield & Co. Ltd. regarding a sample of aged axle oil for testing. | 16th Jan 1930 | Box 32 \ 3 Scan176 | |
| Letter from C.C. Wakefield & Co. regarding a laboratory update on a sample of 'aged' oil. | 17th Jan 1930 | Box 32 \ 3 Scan177 | |
| Letter from C.C. Wakefield & Co. Ltd. arranging the dispatch of Wakefield Hypoy Compound to New York for a test. | 2nd Apr 1930 | Box 32 \ 3 Scan178 | |
| Alternative oils for hypoid axles and comparing suppliers. | 4th Apr 1930 | Box 32 \ 3 Scan179 | |
| Letter to Messrs. C.C. Wakefield & Co. Ltd. requesting the address of their representative in New York. | 4th Apr 1930 | Box 32 \ 3 Scan180 | |
| Letter from C.C. Wakefield & Co. Ltd. providing the address of their New York office. | 7th Apr 1930 | Box 32 \ 3 Scan181 | |
| Letter to C.C. Wakefield & Co. Ltd. asking for a recommendation for a thinner gearbox oil as their 'S' oil is too thick. | 8th May 1930 | Box 32 \ 3 Scan182 | |
| Letter from C.C. Wakefield & Co., Ltd. regarding the lubrication of gear boxes. | 9th May 1930 | Box 32 \ 3 Scan183 | |
| Post Office Telegraph arranging a meeting concerning Evans Wakefield Co. | 13th Nov 1917 | Box 32 \ 3 Scan184 | |
| Letter from C.C. Wakefield & Co. Limited confirming the arrival time of their Chief Chemist for a visit to the works. | 14th May 1930 | Box 32 \ 3 Scan185 | |
| Test of Wakefields Castrol 'S' oil in Phantom II gearboxes, noting its poor performance compared to the standard oil. | 13th Jun 1930 | Box 32 \ 3 Scan186 | |
| Letter to C.C. Wakefield & Co. Ltd. regarding dynamometer test results for a gearbox oil. | 16th Jun 1930 | Box 32 \ 3 Scan187 | |
| Letter from C.C. Wakefield & Co. Ltd. arranging for their Chief Chemist to discuss a matter with the Experimental Department. | 18th Jun 1930 | Box 32 \ 3 Scan188 | |
| Letter from C.C. Wakefield & Co. Ltd proposing a meeting for the following Tuesday morning. | 19th Jun 1930 | Box 32 \ 3 Scan189 | |
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