| Description | Date | Identifier | |
| Letter concluding test results indicating higher loads can be carried with less wear when sulphur is present. | 6th Jan 1938 | Box 145 \ 1 scan0240 | |
| Letter discussing cylinder corrosion and piston 'freezing' issues in exported cars before despatch. | 6th Jan 1938 | Box 145 \ 1 scan0241 | |
| Routine procedure for preparing a car after unloading from the docks following a sea voyage. | 6th Jan 1938 | Box 145 \ 1 scan0242 | |
| Engine maintenance advice regarding oil for cars that have been in storage and symptoms of worn components. | 14th Jan 1937 | Box 145 \ 1 scan0243 | |
| Letter to The Vacuum Oil Co. regarding the use of mineral oil to treat cylinder bores on cars sent abroad. | 14th Jan 1937 | Box 145 \ 1 scan0244 | |
| Requesting an official order for a 5-gallon drum of 'HGL' oil from the Vacuum Oil Co. for use in car back axles. | 18th Jan 1938 | Box 145 \ 1 scan0245 | |
| Internal request to issue an official order for one gallon of Mobiloil A oil to Messrs. Sanderson & Holmes. | 22th Jan 1938 | Box 145 \ 1 scan0246 | |
| Letter to The Vacuum Oil Co. regarding the altering of oil viscosities which makes instruction books recommend unsuitable oil. | 21th Feb 1938 | Box 145 \ 1 scan0247 | |
| Letter from Vacuum Oil Company Limited advising of a delay in response due to an accident. | 22th Feb 1938 | Box 145 \ 1 scan0248 | |
| Letter to Vacuum Oil Co. Ltd. regarding a meeting to discuss oil recommendations in an instruction book. | 4th Mar 1938 | Box 145 \ 1 scan0249 | |
| Letter from the Vacuum Oil Company to S. H. Grylls regarding the company's policy on oil grade numbering, specifically the VIS and S.A.E. classifications. | 21th Mar 1938 | Box 145 \ 1 scan0250 | |
| Letter to V.O.Co., Ltd. regarding the preference for using brand name oils over S.A.E. numbers in instruction books. | 21th Mar 1938 | Box 145 \ 1 scan0251 | |
| Invitation from the Apprentices' Association to a lecture on the application of cutting oils to modern machine tools. | 6th Apr 1938 | Box 145 \ 1 scan0252 | |
| Letter from the Vacuum Oil Company proposing a meeting to discuss the lubrication of Rolls-Royce and Bentley cars. | 6th Apr 1938 | Box 145 \ 1 scan0253 | |
| Internal request to order two 20-gallon drums of Mobiloil Arctic Oil. | 3rd May 1938 | Box 145 \ 1 scan0254 | |
| Letter from Vacuum Oil Company Limited regarding ongoing corrosion tests on an 'ACI' alloy washer. | 16th May 1938 | Box 145 \ 1 scan0255 | |
| Letter to Vacuum Oil Co. Ltd. clarifying the material composition of a patented R.R. alloy used for a differential washer. | 17th May 1938 | Box 145 \ 1 scan0256 | |
| Letter from the Vacuum Oil Company detailing the results of corrosion tests on A.C.I and bronze washers. | 25th May 1938 | Box 145 \ 1 scan0257 | |
| Letter from Vacuum Oil Company regarding heat immersion tests on bushes in MOBILOIL HGL. | 30th May 1938 | Box 145 \ 1 scan0258 | |
| Letter to the Vacuum Oil Co. Ltd. regarding standardizing materials for use with a Hypoid lubricant containing free sulphur. | 1st Jun 1938 | Box 145 \ 1 scan0259 | |
| Letter from Vacuum Oil Company regarding a sample of MOBILOIL 'A' for testing. | 20th Jun 1938 | Box 145 \ 1 scan0260 | |
| Covering order for inhibitor treated Mobiloil A. | 21th Jun 1938 | Box 145 \ 1 scan0261 | |
| Letter to Vacuum Oil Co. Ltd. ordering Mobiloil A for testing its effect on piston scuffing. | 21th Jun 1938 | Box 145 \ 1 scan0262 | |
| Letter from the Vacuum Oil Company confirming dispatch of Mobiloil 'A' and advising on its use for an engine in storage. | 22th Jun 1938 | Box 145 \ 1 scan0263 | |
| Discrepancy in a Mobiloil A order from Vacuum Oil Co. Ltd., seeking approval to pay for the incorrect quantity received. | 16th Jul 1938 | Box 145 \ 1 scan0264 | |
| Confirming receipt of 10 gallons of inhibitor treated Mobiloil A from the Vacuum Oil Co. | 18th Jul 1938 | Box 145 \ 1 scan0265 | |
| Letter from Vacuum Oil Company regarding a new inhibitor-treated oil for running-in engines. | 28th Jul 1938 | Box 145 \ 1 scan0266 | |
| Letter to The Vacuum Oil Company Ltd. requesting a 5-gallon supply of oil for running-in engine tests. | 29th Jul 1938 | Box 145 \ 1 scan0267 | |
| Letter from Vacuum Oil Company Limited regarding the preparation and shipping of an experimental oil for running-in purposes. | 2nd Aug 1938 | Box 145 \ 1 scan0268 | |
| Letter from Vacuum Oil Company regarding a new shock absorber fluid for Luvax Piston-Type Shock Absorbers. | 10th Aug 1938 | Box 145 \ 1 scan0269 | |
| Letter to the Vacuum Oil Company regarding an issue with sending an oil sample from a drum and a plan to test a new batch. | 3rd Sep 1938 | Box 145 \ 1 scan0270 | |
| Telegram to Vacuum Phone London urgently requesting oil for H.G.L. axle tests. | 7th Sep 1938 | Box 145 \ 1 scan0271 | |
| Telegram received by telephone regarding a Mobiloil delivery. | 1st Sep 1938 | Box 145 \ 1 scan0272 | |
| Telegram to Grylls at Dycar Derby regarding the arrival of a car (HGL) at the works. | 7th Sep 1924 | Box 145 \ 1 scan0273 | |
| Letter from Vacuum Oil Company Limited confirming a telegram and the dispatch of a package of Mobiloil. | 7th Sep 1938 | Box 145 \ 1 scan0274 | |
| Telegram received by telephone form regarding a delivery. | 1st Sep 1938 | Box 145 \ 1 scan0275 | |
| Letter from Vacuum Oil Company Limited regarding inhibitor-treated oils and greases. | 8th Sep 1938 | Box 145 \ 1 scan0276 | |
| Letter from the Vacuum Oil Company confirming the suitability of Mobilgrease No.5 for motor car dynamos. | 11th Oct 1938 | Box 145 \ 1 scan0277 | |
| Letter from the Vacuum Oil Company about a special extreme pressure oil (EX.144) for running-in new engines. | 11th Oct 1938 | Box 145 \ 1 scan0278 | |
| Specification sheet for oil from the Vacuum Oil Company, Limited. | 12th Oct 1938 | Box 145 \ 1 scan0279 | |
| Letter to the Vacuum Oil Company, Ltd. regarding a delayed response from Mr. Robotham. | 12th Oct 1938 | Box 145 \ 1 scan0280 | |
| Letter from Vacuum Oil Company regarding a test sample of MOBILOIL 'GX' for use in back axles. | 22th Dec 1938 | Box 145 \ 1 scan0281 | |
| Letter from C.C. Wakefield & Co. regarding a delay in reporting on the examination of engine deposit samples. | 4th Jan 1932 | Box 145 \ 2 scan0001 | |
| Letter from C.C. Wakefield & Co. Limited regarding the analysis of Castrol 'XL' oil and engine deposits from a special test engine. | 19th Jan 1932 | Box 145 \ 2 scan0002 | |
| Chemical analysis of deposit from a crank web and crank journal. | 19th Jan 1932 | Box 145 \ 2 scan0003 | |
| Analysis of deposit from a piston head, detailing its chemical composition. | 19th Jan 1932 | Box 145 \ 2 scan0004 | |
| Chemical analysis and conclusion on a deposit found within an engine crankcase, sent by the Chief Chemist of C. C. Wakefield & Co. Limited. | 15th Mar 1932 | Box 145 \ 2 scan0005 | |
| Request to order a 5-gallon drum of Wakefield's Castrol 'XXL' oil for experimental testing as a substitute for another gear oil. | 15th Mar 1932 | Box 145 \ 2 scan0006 | |
| Laboratory comparison of Wakefield's Castrol 'XXL' oil and Price's Amber 'A' oil for use in gearboxes and spiral bevel rear axles. | 18th Mar 1932 | Box 145 \ 2 scan0007 | |
| Mileage test results for 'KKL' oil in experimental car gearboxes and a recommendation for its use. | 18th May 1932 | Box 145 \ 2 scan0008 | |
| Letter from C.C. Wakefield & Co. regarding sending two drums of special oil for engine testing. | 18th Aug 1932 | Box 145 \ 2 scan0009 | |
| Requesting an order for a 5-gallon drum of Wakefield's 'XXL' gear oil for testing purposes. | 20th Jun 1932 | Box 145 \ 2 scan0010 | |
| Request to order and test Wakefield's special hydraulic shock absorber oil as a potential replacement for Castrol 'F'. | 2nd Dec 1932 | Box 145 \ 2 scan0011 | |
| Internal request to order a 5-gallon drum of 'Castraulic' hydraulic brake fluid from Wakefields. | 31th Dec 1932 | Box 145 \ 2 scan0012 | |
| Letter detailing the examination of a 25HP car engine after a 7,000-mile test using treated XL Oil. | 11th Jan 1933 | Box 145 \ 2 scan0013 | |
| Typed letter discussing upcoming and past tests to determine oil differences in cars or engines. | 13th Jan 1933 | Box 145 \ 2 scan0014 | |
| Letter from C.C. Wakefield & Co. to Rolls-Royce discussing oil tests on a car and an aero engine. | 13th Jan 1933 | Box 145 \ 2 scan0015 | |
| Reporting on a 10,000-mile test using Wakefield's Special Helmore Oil in car GLN-60. | 6th Mar 1933 | Box 145 \ 2 scan0016 | |
| Provision of one gallon of Wakefields Extreme Pressure Lubricant for testing on a new Phantom II axle. | 1st Nov 1933 | Box 145 \ 2 scan0017 | |
| Failure of Wakefield's Gearease for axle lubrication and reverting to Whitmore Compound. | 8th Nov 1933 | Box 145 \ 2 scan0018 | |
| Test report on Hypoid Axle Oil for a Phantom II new rear axle using Wakefields Extreme Pressure Lubricant. | 17th Nov 1933 | Box 145 \ 2 scan0019 | |
| Use of Wakefield's Gearease for axle lubrication. | 27th Nov 1933 | Box 145 \ 2 scan0020 | |
| Comparing the cost and suitability of Wakefield's Gearease against Whitmore's Compound for axle lubrication. | 29th Nov 1933 | Box 145 \ 2 scan0021 | |
| Letter to C.C. Wakefield & Co. Ltd. inquiring about the effects of mixing gear oils and requesting a specific grease. | 24th Jan 1934 | Box 145 \ 2 scan0022 | |
| Letter from C.C. Wakefield & Co. Ltd. discussing the properties of new lubricants and experimental greases. | 26th Jan 1934 | Box 145 \ 2 scan0023 | |
| Request to C.C. Wakefield & Co. Ltd. for a sample of E.P. lubricant for comparative bearing tests. | 27th Feb 1934 | Box 145 \ 2 scan0024 | |
| Letter from C.C. Wakefield & Co. Ltd. arranging for a 5-gallon despatch to Messrs. Ransome & Marles. | 28th Feb 1934 | Box 145 \ 2 scan0025 | |
| Order for a 5-gallon drum of lubricant for bearing tests by a third party. | 16th Mar 1934 | Box 145 \ 2 scan0026 | |
| Requesting a covering order to process an invoice for lubricant from C.C. Wakefield & Co. | 15th Mar 1934 | Box 145 \ 2 scan0027 | |
| Letter from C.C. Wakefield & Co. Ltd. confirming the dispatch of a five-gallon drum of Wakefield E.P. Lubricant. | 4th May 1934 | Box 145 \ 2 scan0028 | |
| Request for viscosity figures for Wakefield's and Whitfield's EP oils, to be compared with Prices Motorine C. | 9th May 1934 | Box 145 \ 2 scan0029 | |
| Laboratory report cover letter regarding comparative viscosity curves of Wakefield's EP oils and Price's Motorine C. | 11th May 1934 | Box 145 \ 2 scan0030 | |
| Graph of viscosity curves for three different oils, plotting temperature against time of efflux. | 11th May 1934 | Box 145 \ 2 scan0031 | |
| Query regarding the suitability of Castrol 'XXL' oil for Bentley engines during summer. | 22th May 1934 | Box 145 \ 2 scan0032 | |
| Use of Castrol XXL oil in a Bentley, advising against its use in winter. | 24th May 1934 | Box 145 \ 2 scan0033 | |
| Letter to C.C. Wakefield & Co. Ltd. about the failure of their EP oil in rear axle bearing tests due to carbon deposits and wear. | 25th May 1934 | Box 145 \ 2 scan0034 | |
| Telegram confirming the dispatch of a five-gallon drum of Castrol Aero C Heavy oil via passenger train. | 12th Jul 1920 | Box 145 \ 2 scan0035 | |
| Letter to C. Wakefield & Co. Ltd. requesting the supply of 15 gallons of Aero 'C' Heavy Oil for a car at Ulster. | 30th Jul 1934 | Box 145 \ 2 scan0036 | |
| Letter from C.C. Wakefield & Co. confirming the dispatch of 18 gallons of Castrol Aero 'C' Heavy oil. | 31th Jul 1934 | Box 145 \ 2 scan0037 | |
| Requesting an order of 'Hi Press' oil from Wakefields for testing in hypoid axles. | 18th Sep 1934 | Box 145 \ 2 scan0038 | |
| Testing of Wakefield's Hi Press oil for hypoid axles. | 27th Sep 1934 | Box 145 \ 2 scan0039 | |
| Requesting an order for 10 gallons of Wakefield's 'Hi-Press' Oil. | 25th Oct 1934 | Box 145 \ 2 scan0040 | |
| Request to order and despatch 30 gallons of Wakefield's CW engine oil to an address in France. | 25th Oct 1934 | Box 145 \ 2 scan0041 | |
| Confirming a request to run a dynamometer test on Hi Press oil for a 40/50 gearbox. | 1st Nov 1934 | Box 145 \ 2 scan0042 | |
| Letter to Mr. Massey detailing the running and results of tests on Hi Press and C.W. oils. | 3rd Nov 1934 | Box 145 \ 2 scan0043 | |
| Cold weather starting issues and proposing tests on various thin oils. | 12th Nov 1934 | Box 145 \ 2 scan0044 | |
| Requesting an order for various winter oils for use in experimental cars. | 13th Nov 1934 | Box 145 \ 2 scan0045 | |
| Letter to The Rover Company Ltd. discussing high pressure lubricants for hypoid axles. | 22th Nov 1934 | Box 145 \ 2 scan0046 | |
| Internal order request for one gallon of Wakefield's Special Gear Oil S for experimental 25 HP cars. | 15th Jan 1935 | Box 145 \ 2 scan0047 | |
| Letter from C.C. Wakefield & Co. regarding the discontinuation of an oil and a recommended replacement. | 5th Feb 1935 | Box 145 \ 2 scan0048 | |
| Inquiry to C.C. Wakefield & Co. Ltd. about the composition of 'CW' Oil. | 5th Feb 1935 | Box 145 \ 2 scan0049 | |
| Letter from C. C. Wakefield & Co. Ltd confirming that Castrol CW is a straight mineral oil. | 6th Feb 1935 | Box 145 \ 2 scan0050 | |
| Letter to Messrs. C.C. Wakefield & Co. Ltd. requesting a supply of a thinner gearbox oil with similar properties to their 'Hi-Press' oil. | 16th Feb 1935 | Box 145 \ 2 scan0051 | |
| Letter from C.C. Wakefield & Co. regarding the supply of CASTROL HI-PRESS oil for experimentation. | 21th Feb 1935 | Box 145 \ 2 scan0052 | |
| Letter from Vacuum Oil Company regarding Mobiloil recommendations and their new 'Clearosol' refining process for 1935 models. | 26th Feb 1935 | Box 145 \ 2 scan0053 | |
| Table of lubrication recommendations from Vacuum Oil Company, Ltd. for 1935 models. | 1st Feb 1935 | Box 145 \ 2 scan0054 | |
| Advance information for automobile manufacturers regarding the new Mobiloil Clearosol Process. | 1st Feb 1935 | Box 145 \ 2 scan0055 | |
| The benefits of a new oil refining process, named the Clearosol process, for improving engine cleanliness and oil stability. | 1st Feb 1935 | Box 145 \ 2 scan0056 | |
| Improvements in motor oil, focusing on valve sticking, carbon deposits, and viscosity. | 1st Feb 1935 | Box 145 \ 2 scan0057 | |
| Comparison of Mobiloil grades, highlighting the advantages of the Clearosol Process in terms of viscosity and reduced oxidation. | 1st Feb 1935 | Box 145 \ 2 scan0058 | |
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