| Description | Date | Identifier | |
| The return and exchange of Wakefield's Hi-press oil. | 18th Aug 1937 | Box 145 \ 2 scan0159 | |
| Letter from C.C. Wakefield & Co. requesting to borrow a hypoid gear for a lubrication exhibition. | 20th Aug 1937 | Box 145 \ 2 scan0160 | |
| Letter to E. Hives requesting a description for an exhibition catalogue and advising on delivery dates for the exhibits. | 20th Aug 1937 | Box 145 \ 2 scan0161 | |
| Letter responding to a request for axle gears, suggesting Packard or Cadillac assemblies as alternatives for inspection due to the enclosed nature of the Rolls-Royce design. | 25th Aug 1937 | Box 145 \ 2 scan0162 | |
| Request to send a pinion and crown wheel on a short-term loan to E.A. Evans at Wakefields Ltd. | 25th Aug 1937 | Box 145 \ 2 scan0163 | |
| Letter from C.C. Wakefield & Co. Ltd acknowledging a letter and advising of a staff members absence on holiday. | 26th Aug 1937 | Box 145 \ 2 scan0164 | |
| Arranging for a Crown Wheel and Pinion from a Phantom III rear axle to be sent for inspection. | 27th Aug 1937 | Box 145 \ 2 scan0165 | |
| Letter from C.C. Wakefield & Co. regarding a sample of Thio-Ether E.P. lubricant sent for testing. | 28th Aug 1937 | Box 145 \ 2 scan0166 | |
| Order for a 10-gallon drum of Castrol CW engine oil. | 31th Aug 1937 | Box 145 \ 2 scan0167 | |
| Acknowledgment of an order for E.P. Gear Oil from C.C. Wakefield & Co. Limited. | 30th Sep 1937 | Box 145 \ 2 scan0168 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding a crown wheel and pinion for an exhibition. | 31th Aug 1937 | Box 145 \ 2 scan0169 | |
| Letter providing specifications for a pair of Hypoid gears intended for a Science Exhibition. | 2nd Sep 1937 | Box 145 \ 2 scan0170 | |
| Delivery confirmation from C.C. Wakefield & Co. for 3 gallons of gear oil. | 28th Aug 1937 | Box 145 \ 2 scan0171 | |
| Letter from C.C. Wakefield & Co. Ltd. (Castrol) acknowledging a letter regarding a pair of gears. | 3rd Sep 1937 | Box 145 \ 2 scan0172 | |
| Letter to an oil company regarding excessive sludge found in a gearbox after an endurance test. | 11th Sep 1937 | Box 145 \ 2 scan0173 | |
| Letter from C. C. Wakefield & Co. Limited acknowledging a request and a pending oil sample for examination. | 13th Sep 1937 | Box 145 \ 2 scan0174 | |
| Letter responding to a query about engine oil, explaining the process for identifying which brand was used when a car left the works. | 23th Dec 1937 | Box 145 \ 2 scan0175 | |
| Changes to the viscosity and naming conventions of Wakefield Oils. | 16th Feb 1938 | Box 145 \ 2 scan0176 | |
| Letter to an oil supplier requesting they label their oils by viscosity rather than trade name for customer clarity. | 21th Feb 1938 | Box 145 \ 2 scan0177 | |
| Letter to Mr. Grylls acknowledging his letter and arranging for a Mr. Massey to visit. | 22th Feb 1938 | Box 145 \ 2 scan0178 | |
| Letter to A. Limb, Esq., confirming a visit with Dr. Helmore. | 29th Apr 1938 | Box 145 \ 2 scan0179 | |
| Letter to W. Robotham confirming a visit on Thursday, May 5th, accompanied by Dr. Helmore. | 28th Apr 1938 | Box 145 \ 2 scan0180 | |
| Letter from C.C. Wakefield & Co. regarding the lower viscosity of Patent Castrol 'XXL' oil for use in gearboxes. | 29th Apr 1938 | Box 145 \ 2 scan0181 | |
| Page two of a letter from C.C. WAKEFIELD & Co. LIMITED regarding the suitability of a new oil for gear boxes. | 29th Apr 1938 | Box 145 \ 2 scan0182 | |
| Urgent internal memo requesting an order for 5 gallons of Wakefield's Shockol. | 24th Jun 1938 | Box 145 \ 2 scan0183 | |
| Laboratory report on the analysis of a used rear axle oil sample, detailing its composition and corrosive effects. | 2nd Jul 1938 | Box 145 \ 2 scan0184 | |
| Letter to C.C. Wakefield & Co. Ltd. requesting an analysis of a Hi-press oil sample from a failed axle. | 5th Jul 1938 | Box 145 \ 2 scan0185 | |
| Requesting to forward a bottle of oil from an experimental rear axle to Messrs C.C. Wakefield & Co. Ltd. | 5th Jul 1938 | Box 145 \ 2 scan0186 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding a sample of Castrol Hi-press for laboratory examination. | 6th Jul 1938 | Box 145 \ 2 scan0187 | |
| Letter from a Castrol representative returning a copy of an inter-department communication. | 7th Jul 1938 | Box 145 \ 2 scan0188 | |
| Letter to Mr. Massey discussing a memo about lubricating oils for Diesel work and thanking him for sending the Hypoid. | 22th Sep 1938 | Box 145 \ 2 scan0189 | |
| Advice of despatch for Castrol Hypoy Gear Oil for hypoid rear axles. | 22th Sep 1938 | Box 145 \ 2 scan0190 | |
| Order and delivery of 'Hypoy' and 'Castrolite' oil. | 23th Sep 1938 | Box 145 \ 2 scan0191 | |
| Letter to C.C. Wakefield & Co. Ltd. sending four samples of 'Castrolite' oil from a Bentley for analysis. | 23th Nov 1938 | Box 145 \ 2 scan0192 | |
| Requesting the dispatch of four oil samples to C.C. Wakefield & Co. Ltd. for analysis. | 23th Nov 1938 | Box 145 \ 2 scan0193 | |
| Letter from C.C. Wakefield & Co. to G.A. Grylls regarding lubricant samples being too small. | 25th Nov 1938 | Box 145 \ 2 scan0194 | |
| Letter to C.C. Wakefield & Co. Ltd. concerning oil samples collected in France and a future test. | 26th Nov 1938 | Box 145 \ 2 scan0195 | |
| Letter from C.C. Wakefield & Co. Ltd. detailing the results of testing four used Castrolite oil samples. | 12th Dec 1938 | Box 145 \ 2 scan0196 | |
| Compliments slip from C.C. Wakefield & Co. Ltd. to S.H. Grylls. | 23th Feb 1939 | Box 145 \ 2 scan0197 | |
| Announcement for a meeting of The Institute of Petroleum's Lubrication Group to discuss a paper on high tension piston rings. | 23th Feb 1939 | Box 145 \ 2 scan0198 | |
| Comparison of BHP loss from gear churning between a plain direct drive and a fully geared gearbox. | 31th Mar 1939 | Box 145 \ 2 scan0199 | |
| Letter to C.C. Wakefield Ltd. sending a used sample of Castrolite oil for analysis. | 5th May 1939 | Box 145 \ 2 scan0200 | |
| Requesting the despatch of a used oil sample to C.C. Wakefield Ltd for research. | 5th May 1939 | Box 145 \ 2 scan0201 | |
| Request for information on a Castrolite oil sample used in a French Test Bentley. | 5th May 1939 | Box 145 \ 2 scan0202 | |
| Letter from C.C. Wakefield & Co. detailing the results of an oil analysis, comparing a used sample to standard Castrolite. | 15th May 1939 | Box 145 \ 2 scan0203 | |
| Letter from C.C. Wakefield & Co. Ltd. giving an opinion on engine oil condition, viscosity, and petrol dilution. | 15th May 1939 | Box 145 \ 2 scan0204 | |
| Letter to C.C. Wakefield & Co. Ltd. detailing the performance of an oil sample from an experimental car. | 23th May 1939 | Box 145 \ 2 scan0205 | |
| Letter from C.C. Wakefield & Co. requesting oil capacity details for 1940 models to prepare their Lubrication Index. | 14th Mar 1940 | Box 145 \ 2 scan0206 | |
| Letter from C.C. Wakefield & Co. to Bentley Motors requesting oil capacity information for 1940 models. | 14th Mar 1940 | Box 145 \ 2 scan0207 | |
| Thank you letter concerning a summary of general lubrication for the Bentley V and Corniche models. | 20th Mar 1940 | Box 145 \ 2 scan0208 | |
| Letter to Messrs. C. C. Wakefield & Co., Ltd. regarding the unavailability of 1940 Instruction Books due to the war. | 20th Mar 1940 | Box 145 \ 2 scan0209 | |
| Request to obtain a 50-gallon drum of Castrolite engine oil against two order numbers. | 27th Mar 1940 | Box 145 \ 2 scan0210 | |
| Letter to C.C. Wakefield Ltd. regarding the testing and approval of oil for new Hypoid bevel gears. | 27th Jun 1928 | Box 145 \ 2 scan0211 | |
| Letter from C.C. Wakefield & Co. regarding the supply of Castrol 'R' oil for testing on cars fitted with Hypoid Bevel Gears. | 20th Sep 1928 | Box 145 \ 2 scan0212 | |
| Letter from C.C. Wakefield & Co. regarding oil for Hypoid Bevel Gears and providing their New York office address. | 19th Nov 1928 | Box 145 \ 2 scan0213 | |
| Use and testing of a standard English oil for hypoid gears. | 20th Nov 1928 | Box 145 \ 2 scan0214 | |
| Request to order 2 gallons of Whitmores oil suitable for Hypoid gears. | 11th Nov 1928 | Box 145 \ 2 scan0215 | |
| Letter to Gleason Works concerning suitable lubricating oils for Hypoid Gears and arranging a test for 'Castrol R' oil. | 23th Nov 1928 | Box 145 \ 2 scan0216 | |
| Letter to C.C. Wakefield & Co. Ltd. regarding the testing of 'Castrol R' oil in Hypoid bevel gears by the Gleason Co. | 28th Dec 1928 | Box 145 \ 2 scan0217 | |
| Letter from C.C. Wakefield & Co. Ltd confirming they will supply 5-gallons of CASTROL 'R' oil free of charge for testing on Hypoid bevel gears. | 1st Jan 1929 | Box 145 \ 2 scan0218 | |
| Confirming a reply has been received from Messrs. C.C. Wakefield & Co., Ltd., and advising of a visit by Mr. Limb and Mr. Evans. | 1st Jan 1929 | Box 145 \ 2 scan0219 | |
| Copy of a letter from C. C. Wakefield & Co. Ltd. arranging a meeting date. | 31th Dec 1928 | Box 145 \ 2 scan0220 | |
| Hypoid axle test of Wakefield's 'Castrol' lubricant. | 21th Feb 1929 | Box 145 \ 2 scan0221 | |
| Letter to C.C. Wakefield Ltd. regarding an unsatisfactory report from The Gleason Co. on tests made with 'R' oil. | 22th Feb 1929 | Box 145 \ 2 scan0222 | |
| Letter from C.C. Wakefield & Co. acknowledging receipt of a report from Gleason Co. regarding Castrol 'R' oil. | 25th Feb 1929 | Box 145 \ 2 scan0223 | |
| Internal request to order two gallons of Whitmores oil No.O. for Hypoid gears to be sent to a hotel in France for Mr. Hancock. | 27th Feb 1929 | Box 145 \ 2 scan0224 | |
| Gear failure with Castrol 'R' oil, mandating the switch to Whitmore's oil for all hypoid axles. | 19th Jul 1929 | Box 145 \ 2 scan0225 | |
| Letter from C.C. Wakefield & Co. regarding the unsatisfactory performance of Castrol 'R' on Hypoid Rear Axles. | 20th Jul 1929 | Box 145 \ 2 scan0226 | |
| Letter from C.C. Wakefield & Co. regarding a sample of a compound similar to 'Whitmore's Compound' for testing. | 24th Jul 1929 | Box 145 \ 2 scan0227 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding the supply of Wakefield Special Compound for testing with Hypoid Gears. | 12th Aug 1929 | Box 145 \ 2 scan0228 | |
| Requesting an analysis of two oil samples for hypoid gears. | 23th Aug 1929 | Box 145 \ 2 scan0229 | |
| Results of testing various lubricating oils for hypoid rear axles. | 23th Aug 1929 | Box 145 \ 2 scan0230 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding an unsatisfactory lubricant compound for Hypoid rear axles. | 24th Aug 1929 | Box 145 \ 2 scan0231 | |
| Lubricating oil for Hypoid Rear Axles. | 26th Aug 1929 | Box 145 \ 2 scan0232 | |
| Importance of using Whitmore's Compound Oil for rear axles and updating the Instruction Book. | 30th Aug 1929 | Box 145 \ 2 scan0233 | |
| Trials and failures of various lubricating oils for hypoid rear axles. | 23th Mar 1929 | Box 145 \ 2 scan0234 | |
| Confirming the lubricant details for the Phantom II chassis rear axle. | 19th Sep 1929 | Box 145 \ 2 scan0235 | |
| Information regarding the lubricant for the Phantom II rear axle, which features a Hypoid gear. | 2nd Oct 1929 | Box 145 \ 2 scan0236 | |
| Tests on special lubricants for Hypoid Axles, referencing a relevant magazine article. | 18th Dec 1929 | Box 145 \ 2 scan0237 | |
| Performance and testing of various axle oils for a Hypoid Axle. | 20th Dec 1929 | Box 145 \ 2 scan0238 | |
| Laboratory report on the unsuitability of Mobilgrease for use in the hypoid axle. | 20th Dec 1929 | Box 145 \ 2 scan0239 | |
| Comparative laboratory and ageing tests on oils for hypoid rear axles from different suppliers. | 16th Jan 1930 | Box 145 \ 2 scan0240 | |
| Failure of two axles during a dynamometer test using a specific gear lubricant, placing an embargo on its use. | 29th Apr 1930 | Box 145 \ 2 scan0241 | |
| Re-lubrication of the 40/50HP rear axle and the supply of Whitmore's Compound. | 29th Apr 1930 | Box 145 \ 2 scan0242 | |
| The results of testing Phantom II gear boxes using a Whitmores Compound lubricant. | 11th Jun 1930 | Box 145 \ 2 scan0243 | |
| Instructions and a proposal for using Whitmore's Compound lubricant in gearboxes. | 20th Mar 1931 | Box 145 \ 2 scan0244 | |
| Use and cost of Whitmore Compound following a failure of Wakefield's material. | 23th Oct 1933 | Box 145 \ 2 scan0245 | |
| From ROY to Hs seeking approval to send an attached memo to Bkl. | 14th Apr 1934 | Box 145 \ 2 scan0246 | |
| Lubricant recommendations for the Bentley Back Axle and a potentially misleading advertisement. | 14th Apr 1934 | Box 145 \ 2 scan0247 | |
| Letter from Vacuum Oil Company requesting feedback on an experimental running-in oil for new engines. | 18th Jan 1939 | Box 145 \ 2 scan0248 | |
| Letter from Vacuum Oil Company regarding the arrangement of engine oil sample testing. | 27th Jan 1939 | Box 145 \ 2 scan0249 | |
| Arranging for engine oil tests on a Wraith vehicle with the Vacuum Oil Co. | 10th Feb 1939 | Box 145 \ 2 scan0250 | |
| Engine oil test on a Wraith, including a request for a new by-pass oil filter. | 15th Feb 1939 | Box 145 \ 2 scan0251 | |
| Correspondence regarding the dispatch of an A.C. filter element and the return of the old one. | 16th Feb 1939 | Box 145 \ 2 scan0252 | |
| Letter to the Vacuum Oil Company Ltd. detailing corrosion issues found with GX and EX.144 oils during dynamometer and engine tests. | 21th Feb 1939 | Box 145 \ 2 scan0253 | |
| Letter from Vacuum Oil Company Limited regarding a sample of MOBILOIL GX and an outer roller race. | 27th Feb 1939 | Box 145 \ 2 scan0254 | |
| Letter from Vacuum Oil Company regarding a paper on oil filters and crankcase oil filtration. | 8th Mar 1939 | Box 145 \ 2 scan0255 | |
| Letter to the Vacuum Oil Company Limited concerning an article on crankcase oil filtration. | 9th Mar 1939 | Box 145 \ 2 scan0256 | |
| Letter detailing corrosion test results for MOBILOIL 'GX' on steel and phosphor-bronze parts. | 28th Mar 1939 | Box 145 \ 2 scan0257 | |
| Letter to the Vacuum Oil Company detailing the results of corrosion tests on 'EP' oils with various metals. | 3rd Apr 1939 | Box 145 \ 2 scan0258 | |
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