| Description | Date | Identifier | |
| From Vacuum Oil Company Limited regarding changes to Mobiloil grades and distribution. | 1st Feb 1935 | Box 145 \ 2 scan0059 | |
| Requesting views on the new Patent Castrol Oil following its successful 10,000-mile test. | 9th Mar 1935 | Box 145 \ 2 scan0060 | |
| Letter from C.C. Wakefield & Co. regarding the renaming of Castrol engine oils to 'Wakefield Patent Castrol'. | 11th Mar 1935 | Box 145 \ 2 scan0061 | |
| Request to order 40 gallons of Wakefield's Tonic XL Oil for the Chateauroux Depot. | 14th Mar 1935 | Box 145 \ 2 scan0062 | |
| Company's skeptical position on new oil grades and claims made by oil companies. | 26th Mar 1935 | Box 145 \ 2 scan0063 | |
| To Roy regarding a delay in the delivery of Tonic XL oil to Chateauroux. | 8th Apr 1935 | Box 145 \ 2 scan0064 | |
| The testing and failures of various extreme pressure lubricants for rear axles and gearboxes. | 29th Jun 1935 | Box 145 \ 2 scan0065 | |
| The performance testing of a lubricant oil for standardisation in various axles and gearboxes. | 20th Jun 1935 | Box 145 \ 2 scan0066 | |
| Letter to C.C. Wakefield & Co. Ltd. requesting a chemist's analysis of a sludge sample from a crankpin. | 9th Jul 1935 | Box 145 \ 2 scan0067 | |
| Letter from C. C. Wakefield & Co. regarding a laboratory report on a crank pin sludge sample. | 10th Jul 1935 | Box 145 \ 2 scan0068 | |
| Laboratory report detailing the chemical analysis of sludge from a crank pin. | 30th Aug 1935 | Box 145 \ 2 scan0069 | |
| Letter to C.C. Wakefield & Co. Ltd. inquiring about standardizing Hi-Press Oil for the Bentley hypoid rear axle. | 30th Aug 1935 | Box 145 \ 2 scan0070 | |
| Letter from C.C. Wakefield & Co. to Rolls-Royce regarding standardising gear oil for the Bentley hypoid rear axle. | 2nd Sep 1935 | Box 145 \ 2 scan0071 | |
| Standardisation of Wakefield's Hi-Press oil for the rear axle. | 29th Jun 1935 | Box 145 \ 2 scan0072 | |
| Letter from C.C. Wakefield & Co. regarding the stability and European distribution of Castrol Hi-Press gear oil. | 14th Sep 1935 | Box 145 \ 2 scan0073 | |
| Letter to an oil company regarding sludge formation in a gearbox and the unsuitability of their Hi-Press oil. | 27th Sep 1935 | Box 145 \ 2 scan0074 | |
| Letter from lubricant manufacturer C.C. Wakefield & Co. regarding a sludge sample collected from a gearbox. | 28th Sep 1935 | Box 145 \ 2 scan0075 | |
| Return advice note for an incorrectly ordered 10-gallon drum of Wakefield Castrol oil to be exchanged. | 14th Oct 1935 | Box 145 \ 2 scan0076 | |
| Letter from C.C. Wakefield & Co. Ltd. to Rolls Royce providing an analysis of a soft black deposit sample. | 17th Oct 1935 | Box 145 \ 2 scan0077 | |
| Letter from C.C. Wakefield & Co. detailing the chemical analysis of mineral matter. | 17th Oct 1935 | Box 145 \ 2 scan0078 | |
| Letter to C.C. Wakefield & Co. Ltd. acknowledging receipt of a deposit analysis. | 18th Oct 1935 | Box 145 \ 2 scan0079 | |
| Letter from Wakefield & Co. regarding the supply of PATENT CASTROL XL oil for testing by Rolls-Royce in France. | 23th Oct 1935 | Box 145 \ 2 scan0080 | |
| Letter from a Castrol representative concerning an analysis of gearbox sludge. | 29th Oct 1935 | Box 145 \ 2 scan0081 | |
| Copy of a letter from E.A. Evans Esq. detailing the chemical analysis of a soft black deposit sample. | 29th Oct 1935 | Box 145 \ 2 scan0082 | |
| Analysis of a sludge sample from a gearbox run on Castrol Hi-Press Light. | 1st Nov 1935 | Box 145 \ 2 scan0083 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding an invoice for a drum of PATENT CASTROL XL oil. | 1st Nov 1935 | Box 145 \ 2 scan0084 | |
| Payment of an invoice for Castrol motor oil from C.C. Wakefield & Co. Ltd. | 4th Nov 1935 | Box 145 \ 2 scan0085 | |
| Letter from the Experimental Department inquiring about acquiring a pressure greasing unit. | 9th Nov 1935 | Box 145 \ 2 scan0086 | |
| Letter from Wakefield House to Mr. Robotham regarding a discussion on greasing equipment. | 11th Nov 1935 | Box 145 \ 2 scan0087 | |
| Official order for a drum of Castrol 'XL' Motor Oil. | 12th Nov 1935 | Box 145 \ 2 scan0088 | |
| Invoice from C.C. Wakefield & Co. Ltd. for Castrol oil and requesting an official order be issued for payment. | 12th Dec 1935 | Box 145 \ 2 scan0089 | |
| Requesting a covering order for Castrol Hi-Press Gear Oil supplied to Chateauroux, France. | 13th Dec 1935 | Box 145 \ 2 scan0090 | |
| Invoice from C.C. Wakefield & Co. Ltd. for a chassis lubricator, with a handwritten instruction to return the item. | 20th Jan 1936 | Box 145 \ 2 scan0091 | |
| Return of a Type 20 F/B Chassis Lubricator and instruction not to pay the invoice. | 23th Jan 1936 | Box 145 \ 2 scan0092 | |
| Return of a trial Type 20 F/B Chassis Lubricator to C.C. Wakefield & Co.Ltd as it was unsuitable. | 23th Jan 1936 | Box 145 \ 2 scan0093 | |
| Comparison of oils and fluid capacities for various components of the Phantom II and Phantom III chassis. | 12th Feb 1936 | Box 145 \ 2 scan0094 | |
| Confirming an order of Castrol XXL oil for experimental work on a 4 1/4 litre Bentley. | 14th Feb 1936 | Box 145 \ 2 scan0095 | |
| Urgent internal memo requesting an order of Wakefield's Castrol XXL oil. | 3rd Mar 1936 | Box 145 \ 2 scan0096 | |
| Letter from C.C. Wakefield & Co. Ltd. proposing a collaborative test of an E.P. lubricant. | 26th Mar 1936 | Box 145 \ 2 scan0097 | |
| Letter to C.C. Wakefield & Co. Ltd. discussing engine lubrication, thin oils, and bearing materials. | 31th Mar 1936 | Box 145 \ 2 scan0098 | |
| Invoice for oil from an external supplier, with a handwritten query about internal sourcing. | 1st Apr 1936 | Box 145 \ 2 scan0099 | |
| Internal request to place an official order for two types of oil from Messrs. Sanderson & Holmes Ltd. | 3rd Apr 1936 | Box 145 \ 2 scan0100 | |
| Request for engine oil viscosity charts sent to Messrs. C.C. Wakefield & Co. Ltd. | 21th Apr 1936 | Box 145 \ 2 scan0101 | |
| Request to order 5 gallons of Wakefield's 'Castraulic' Oil. | 24th Apr 1936 | Box 145 \ 2 scan0102 | |
| Laboratory report on the distillation analysis of 'Castraulic' Brake Fluid from Wakefield and Co. | 25th Apr 1936 | Box 145 \ 2 scan0103 | |
| Issue with solidified rear axle oil for the Phantom II chassis and recommending a different lubricant. | 28th May 1936 | Box 145 \ 2 scan0104 | |
| Letter to an oil supplier regarding the failure of Hi-Press oil during a high-temperature test on heavily loaded hypoid gears. | 3rd Jun 1936 | Box 145 \ 2 scan0105 | |
| Letter from C. C. Wakefield & Co. confirming receipt of a sample of used Castrol Hi-Press for laboratory examination. | 4th Jun 1936 | Box 145 \ 2 scan0106 | |
| Letter to a lubricant supplier about high gearbox temperatures in a Phantom III chassis and the need for a suitable extreme pressure lubricant. | 27th Jun 1936 | Box 145 \ 2 scan0107 | |
| Invoice from Sanderson & Holmes Ltd. for Castrol oil and a request for an order to be issued for payment. | 8th Sep 1936 | Box 145 \ 2 scan0108 | |
| Recommendation for an alternative steering oil for Phantom III & 25/30 HP models. | 9th Sep 1936 | Box 145 \ 2 scan0109 | |
| Requesting an official order for 2 gallons of Castrol XXL Oil. | 9th Sep 1936 | Box 145 \ 2 scan0110 | |
| Urgent request to order 50 gallons of Castrol XL oil for a 10,000-mile test at Chateauroux. | 10th Sep 1936 | Box 145 \ 2 scan0111 | |
| Oil filter sludge issues on the Phantom III car when using Price's Motorine 'C' oil, with a recommendation to use Castrol 'XL' oil. | 21th Sep 1936 | Box 145 \ 2 scan0112 | |
| Recommendation to use Wakefield's Castrol 'XL' engine oil for the Phantom III chassis due to sludge issues with Price's Motorine 'C'. | 23th Sep 1936 | Box 145 \ 2 scan0113 | |
| Request for six blank oil viscosity charts from C.C. Wakefield & Co. Ltd. | 1st Oct 1936 | Box 145 \ 2 scan0114 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding a request for viscosity charts. | 2nd Oct 1936 | Box 145 \ 2 scan0115 | |
| Requesting the use of Hi-Press oil in Bentley steering boxes following a successful trial. | 15th Oct 1936 | Box 145 \ 2 scan0116 | |
| Requesting viscosity and oil consumption curves for a specific oil from the Laboratory, in reference to a letter from Wakefield's. | 6th Nov 1936 | Box 145 \ 2 scan0117 | |
| Letter confirming the dispatch of a 5-gallon drum of new PATENT CASTROL CW oil. | 5th Nov 1936 | Box 145 \ 2 scan0118 | |
| Invoice from Sanderson & Holmes Ltd. for Castrol oil that has not been booked in. | 6th Nov 1936 | Box 145 \ 2 scan0119 | |
| Letter to C.C. Wakefield & Co., Ltd. requesting a viscosity curve for an oil. | 6th Nov 1936 | Box 145 \ 2 scan0120 | |
| Short typed letter acknowledging a request made by Mr. Robotham. | 9th Nov 1936 | Box 145 \ 2 scan0121 | |
| Letter to C.C. Wakefield & Co.,Ltd. requesting viscosity data for a lighter 'C.W.' oil. | 10th Nov 1936 | Box 145 \ 2 scan0122 | |
| Letter regarding PATENT CASTROL CW being passed along to the Chief Chemist. | 11th Nov 1936 | Box 145 \ 2 scan0123 | |
| Request to book in two 1-gallon cans of Castrol X.X.L. oil. | 12th Nov 1936 | Box 145 \ 2 scan0124 | |
| Comparative test report on oil and petrol consumptions for two vehicles using Castrol XL and Mobiloil Artic oils. | 18th Nov 1936 | Box 145 \ 2 scan0125 | |
| Comparative report on oil and petrol consumption using Castrol XL and Mobiloil Artic oils. | 18th Nov 1936 | Box 145 \ 2 scan0126 | |
| Letter to an oil supplier regarding a suspected change in Hi-Press oil composition causing sludge issues in a Bentley axle. | 4th Dec 1936 | Box 145 \ 2 scan0127 | |
| Letter from C.C. Wakefield & Co. regarding Castrol Hi-Press lubricant and an upcoming visit. | 5th Dec 1936 | Box 145 \ 2 scan0128 | |
| Invoice from C.C. Wakefield & Co. Ltd. to Rolls-Royce Ltd. for a free test sample of Rolls-Royce E.P. Oil. | 18th Dec 1936 | Box 145 \ 2 scan0129 | |
| Request to examine and compare the consistency of Shell shock absorber oil with Mobiloil Arctic. | 21th Jan 1937 | Box 145 \ 2 scan0130 | |
| Wakefields withdrawing Hi-press oil and replacing it with R.R. EP. oil for testing purposes. | 16th Feb 1937 | Box 145 \ 2 scan0131 | |
| New, thinner grade of Wakefield C.W. oil and arranging for its testing on Phantom III cars. | 17th Feb 1937 | Box 145 \ 2 scan0132 | |
| Expressing reluctance towards experimental work on Trials Cars due to reliability concerns and past failures. | 19th Feb 1937 | Box 145 \ 2 scan0133 | |
| The arrival of two 5-gallon drums of Wakefields CW oil and a request for instructions. | 23th Feb 1937 | Box 145 \ 2 scan0134 | |
| The use and testing of Wakefield C.W. oil. | 23th Feb 1937 | Box 145 \ 2 scan0135 | |
| Experimental use of a specific oil in Trials cars. | 24th Feb 1937 | Box 145 \ 2 scan0136 | |
| Compliments slip from C.C. Wakefield & Co. Ltd. | 1st Mar 1937 | Box 145 \ 2 scan0137 | |
| Invoice from C.C. Wakefield & Co. Ltd for a free-for-test drum of E.P. Oil. | 1st Mar 1937 | Box 145 \ 2 scan0138 | |
| Letter to Mr. Massey regarding the results of a gearbox dynamometer test using RR EP oil. | 5th Mar 1937 | Box 145 \ 2 scan0139 | |
| Letter regarding engine oil pressure and the proposed use of Castrol XXL oil for the Paris Trials Car, chassis B.8.GA. | 22th Mar 1937 | Box 145 \ 2 scan0140 | |
| Letter from C.C. Wakefield & Co. Ltd. discussing the chemical analysis of vermillion colouring on pinions. | 21th Apr 1937 | Box 145 \ 2 scan0141 | |
| Letter to C.C. Wakefield & Co. discussing Vermillion colouring in gearboxes and a failed ball bearing. | 23th Apr 1937 | Box 145 \ 2 scan0142 | |
| Letter from C.C. Wakefield & Co. regarding the development and chemical composition of Castrol Hi-Press E.P. lubricants. | 28th May 1937 | Box 145 \ 2 scan0143 | |
| Letter from C.C. Wakefield & Co. Ltd discussing the properties and applications of Castrol Hi-Press and Hypoy lubricants. | 28th May 1937 | Box 145 \ 2 scan0144 | |
| Letter to C.C. Wakefield & Co. Ltd. requesting data on Extreme Pressure Lubricants. | 31th May 1937 | Box 145 \ 2 scan0145 | |
| Letter from C.C. Wakefield & Co. enclosing a report from the American Petroleum Institute on sump draining. | 3rd Jun 1937 | Box 145 \ 2 scan0146 | |
| Recommended practice and reasons for crankcase oil changes in passenger cars for winter and summer conditions. | 22th Jan 1937 | Box 145 \ 2 scan0147 | |
| The reasons for and cost-effectiveness of frequent crankcase draining and oil changes. | 15th May 1937 | Box 145 \ 2 scan0148 | |
| Letter from C.C. Wakefield & Co. regarding the film rupture strength of lubricants. | 4th Jun 1937 | Box 145 \ 2 scan0149 | |
| Letter from C.C. Wakefield & Co. Limited regarding the unavailability of the S.A.E. machine and specifications for Hypoy lubricant. | 4th Jun 1937 | Box 145 \ 2 scan0150 | |
| Request to send two 20-gallon drums of Castrol C.W. to Mr. Hancock in Chateauroux, France. | 24th Jun 1937 | Box 145 \ 2 scan0151 | |
| Message regarding an unreceived 40-gallon oil order for Chateauroux. | 13th Jul 1937 | Box 145 \ 2 scan0152 | |
| Letter from C.C. Wakefield & Co. confirming the urgent dispatch of a 40-gallon barrel of Castrol oil. | 14th Jul 1937 | Box 145 \ 2 scan0153 | |
| Letter to C.C. Wakefield & Co. regarding an oil failure during axle gear tests. | 11th Aug 1937 | Box 145 \ 2 scan0154 | |
| Letter from C.C. Wakefield & Co. Ltd. acknowledging a previous letter and a sample for examination. | 12th Aug 1937 | Box 145 \ 2 scan0155 | |
| To temporarily halt the use of a specific batch of Wakefield Hi Press Oil for rear axles. | 16th Aug 1937 | Box 145 \ 2 scan0156 | |
| Letter from a Castrol representative regarding reports and queries on Castrol Hi-Press. | 14th Aug 1937 | Box 145 \ 2 scan0157 | |
| The suspension of use for a specific batch of rear axle oil. | 16th Aug 1937 | Box 145 \ 2 scan0158 | |
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