| Description | Date | Identifier | |
| Requesting daily reports on the oil consumption of a Trials car. | 3rd Jul 1936 | Box 144 \ 3 scan0068 | |
| High oil consumption in 25/30 HP models and the need to fast-track a new piston ring design. | 3rd Jul 1936 | Box 144 \ 3 scan0069 | |
| Oil consumption for unit C.16, detailing test run metrics and component specifications. | 7th Jul 1936 | Box 144 \ 3 scan0070 | |
| Customer complaints about high oil consumption in new 25/30 models. | 8th Jul 1936 | Box 144 \ 3 scan0071 | |
| Test results for oil consumption on Unit U7S with standard piston and rings. | 8th Jul 1936 | Box 144 \ 3 scan0072 | |
| Calling a conference to discuss a serious complaint regarding 25/30 HP oil consumption. | 8th Jul 1936 | Box 144 \ 3 scan0073 | |
| Calling a conference to discuss a serious complaint about 25/30 HP oil consumption. | 5th Jul 1936 | Box 144 \ 3 scan0074 | |
| Test report on oil consumption for unit U.75 using standard piston rings. | 9th Jul 1936 | Box 144 \ 3 scan0075 | |
| Letter discussing the investigation of a customer's car's high oil consumption and potential causes. | 9th Jul 1936 | Box 144 \ 3 scan0076 | |
| Telegram about an overoiling issue in London traffic and a potential solution. | 9th Jul 1936 | Box 144 \ 3 scan0077 | |
| The oil consumption of the 25/30 HP engine, detailing the risk of piston seizures if consumption is too low. | 9th Jul 1936 | Box 144 \ 3 scan0078 | |
| The oil consumption of trial cars GUL-82 and GUL-1. | 9th Jul 1936 | Box 144 \ 3 scan0079 | |
| Investigating the high oil consumption on the 25/30 Chassis, comparing piston and ring arrangements with other models. | 9th Jul 1936 | Box 144 \ 3 scan0080 | |
| Tests on modified rings and the trial of three-ring pistons. | 9th Jul 1936 | Box 144 \ 3 scan0081 | |
| Expressing shock and concern over high oil consumption in the 25/30 chassis due to a piston ring design change. | 10th Jul 1936 | Box 144 \ 3 scan0082 | |
| Procedure for measuring oil consumption in trials cars. | 13th Jul 1936 | Box 144 \ 3 scan0083 | |
| Major complaints of high oil consumption and clutch trouble, proposing solutions and further testing. | 13th Jul 1936 | Box 144 \ 3 scan0084 | |
| Oil consumption test on unit U-7-S during a run to Sheffield. | 14th Jul 1936 | Box 144 \ 3 scan0085 | |
| Oil consumption test results for engine unit 21-G-IV, C-16. | 14th Jul 1936 | Box 144 \ 3 scan0086 | |
| Oil consumption on the 25/30 HP chassis, piston performance, and testing. | 14th Jul 1936 | Box 144 \ 3 scan0087 | |
| Improvements to the 25/30 HP engine's oil consumption and investigations into piston faults. | 14th Jul 1936 | Box 144 \ 3 scan0088 | |
| Graph plotting oil consumption in M.P.G. against distance for 25 HP models during 10,000-mile tests. | 14th Jul 1936 | Box 144 \ 3 scan0089 | |
| Line graph plotting Bentley oil consumption in M.P.G. over a distance of up to 8,000 miles from various tests. | 14th Jul 1936 | Box 144 \ 3 scan0090 | |
| Interchangeability and fitting of turned scraper rings from Bentley models to the 25/30HP model. | 13th Jul 1936 | Box 144 \ 3 scan0091 | |
| Oil consumption test run to Oxford and return. | 15th Jul 1936 | Box 144 \ 3 scan0092 | |
| Oil consumption for unit C-16 during an evening test run to Buxton and return. | 15th Jul 1936 | Box 144 \ 3 scan0093 | |
| Oil and petrol consumption statistics for engine unit C-16. | 15th Jul 1936 | Box 144 \ 3 scan0094 | |
| Oil consumption data for unit GAE-20. | 17th Jul 1936 | Box 144 \ 3 scan0095 | |
| Oil consumption test run for a Chevrolet vehicle to Oxford and back, noting engine performance issues. | 31th Jul 1936 | Box 144 \ 3 scan0096 | |
| Letter discussing oil consumption issues with the Big Bore 20/25, a new piston ring solution, and urging attendance at the T.T. Race. | 8th Aug 1936 | Box 144 \ 3 scan0097 | |
| Two approaches to solving high oil consumption on the 25/30 model. | 8th Aug 1935 | Box 144 \ 3 scan0098 | |
| Modifications to piston rings to improve oil consumption on certain models. | 10th Aug 1936 | Box 144 \ 3 scan0099 | |
| Oil consumption tests for the 20/25 Programme and Bentley models, detailing piston ring configurations. | 10th Aug 1936 | Box 144 \ 3 scan0100 | |
| Outlining a four-point programme to address top overoiling for the P.111. | 10th Aug 1936 | Box 144 \ 3 scan0101 | |
| 25/30HP oil consumption test, investigating the effect of 'L' shaped rings and connecting rod modifications. | 8th Aug 1936 | Box 144 \ 3 scan0102 | |
| 25/30 HP engine oil consumption tests comparing standard and L-shaped piston rings. | 1st Aug 1936 | Box 144 \ 3 scan0103 | |
| Blueprint detailing the specifications for a section piston ring. | 11th Aug 1936 | Box 144 \ 3 scan0104 | |
| Tests conducted to investigate excessive oil consumption in the 25/30 model. | 11th Aug 1936 | Box 144 \ 3 scan0105 | |
| Tests conducted on various scraper and compression rings to control oil consumption. | 11th Aug 1936 | Box 144 \ 3 scan0106 | |
| The testing and development of piston rings, including L-section types, to improve engine oil consumption. | 11th Aug 1936 | Box 144 \ 3 scan0107 | |
| Piston ring experiments, detailing issues with L-section rings, blow-by, oil consumption, and proposed solutions. | 11th Aug 1936 | Box 144 \ 3 scan0108 | |
| Piston and oil consumption tests comparing different scraper rings and components. | 24th Aug 1936 | Box 144 \ 3 scan0109 | |
| Comparison of two oil consumption tests for the 21-G-IV engine with different piston ring and connecting rod setups. | 24th Aug 1936 | Box 144 \ 3 scan0110 | |
| Need for more data to investigate ongoing complaints of excessive oil consumption and overoiling on Bentley cars. | 31th Aug 1936 | Box 144 \ 3 scan0111 | |
| Analysis of customer complaints regarding excessive oil consumption and over-oiling in Bentley chassis. | 1st Sep 1936 | Box 144 \ 3 scan0112 | |
| Continued report page discussing the bedding-in of piston rings during vehicle testing. | 1st Sep 1936 | Box 144 \ 3 scan0113 | |
| The investigation into the cause of top overoiling on the Phantom III engine. | 25th Sep 1936 | Box 144 \ 3 scan0114 | |
| Experiments with various bottom washers, grommets, and valve stems to improve performance and reduce costs. | 2nd Sep 1936 | Box 144 \ 3 scan0115 | |
| Request for information and procedure for measuring oil consumption on the Phantom III model. | 30th Sep 1936 | Box 144 \ 3 scan0116 | |
| Short memorandum concerning providing further figures on oil consumption for the Phantom III. | 1st Oct 1936 | Box 144 \ 3 scan0117 | |
| Excessive oil consumption and over-oiling complaints for Bentley vehicles. | 31th Aug 1936 | Box 144 \ 3 scan0118 | |
| Summary of Chevrolet consumption test results. | 7th Oct 1936 | Box 144 \ 3 scan0119 | |
| Letter to The Perfect Circle Ring Co. in the USA, concerning oil consumption problems with a six-cylinder engine. | 13th Oct 1936 | Box 144 \ 3 scan0120 | |
| Piston ring radial thickness and pressure for an engine, comparing practices with those in America. | 13th Oct 1936 | Box 144 \ 3 scan0121 | |
| Performance and design of different types of piston rings. | 13th Oct 1936 | Box 144 \ 3 scan0122 | |
| Questionnaire regarding the design and specifications of piston rings. | 13th Oct 1936 | Box 144 \ 3 scan0123 | |
| The manufacturing and performance of engine rings and pistons. | 13th Oct 1936 | Box 144 \ 3 scan0124 | |
| Letter requesting information on acceptable cylinder bore irregularities and their effect on oil consumption. | 13th Oct 1936 | Box 144 \ 3 scan0125 | |
| Successful trial for top over-oiling on the Phantom III engine. | 15th Oct 1936 | Box 144 \ 3 scan0126 | |
| Excessive oil consumption on the Bentley 4¼ litre chassis and potential solutions. | 15th Oct 1936 | Box 144 \ 3 scan0127 | |
| The oil consumption of a 25/30 HP engine, vehicle 22-G-V, after fitting a new cylinder block and 'L' shaped rings. | 15th Oct 1936 | Box 144 \ 3 scan0128 | |
| Notes on information required regarding oil consumption. | 17th Nov 1936 | Box 144 \ 3 scan0129 | |
| Engine oil consumption tests comparing different piston ring configurations. | 18th Nov 1936 | Box 144 \ 3 scan0130 | |
| Oil consumption figures for a Bentley 3.B.1V, Unit B.18, after a test run with new parts. | 8th Dec 1936 | Box 144 \ 3 scan0131 | |
| Oil consumption results for Bentley Trials Cars B-2-GA and B-3-GA. | 8th Jan 1937 | Box 144 \ 3 scan0132 | |
| Log of car oil consumption and mileage for November and December. | 7th Jan 1937 | Box 144 \ 3 scan0133 | |
| Record of oil consumption for car 'B 2 GA' during November and December, detailing mileage and oil added. | 7th Jan 1937 | Box 144 \ 3 scan0134 | |
| Request for information on when pistons and cylinders were changed for car 34EX, attached to oil consumption reports for the 25/30 and Phantom III models. | 7th Jan 1937 | Box 144 \ 3 scan0135 | |
| The oil consumption and mileage for vehicle GUL 1. | 1st Jan 1937 | Box 144 \ 3 scan0136 | |
| Oil consumption of vehicle 34 EX, including mileage readings and oil quantities added. | 4th Jan 1937 | Box 144 \ 3 scan0137 | |
| Record of oil consumption for car 3-AZ-22, detailing mileage readings and the quantity of oil added. | 5th Jan 1937 | Box 144 \ 3 scan0138 | |
| Oil consumption differences between oil types ('Mobil-arctic', 'Castrol XL') and the impact of mild weather. | 11th Jan 1937 | Box 144 \ 3 scan0139 | |
| Oil consumption figures for the Bentley Trials Car B-4-GA. | 12th Jan 1937 | Box 144 \ 3 scan0140 | |
| The oil consumption for car B 4 GA for November and December. | 8th Jan 1937 | Box 144 \ 3 scan0141 | |
| List of different oils used in each of the trials cars. | 13th Jan 1937 | Box 144 \ 3 scan0142 | |
| Referencing a list of oil types used in present Rolls-Royce and Bentley Trials Cars. | 14th Jan 1937 | Box 144 \ 3 scan0143 | |
| Oil consumption and the importance of achieving round and parallel cylinder bores. | 15th Jan 1937 | Box 144 \ 3 scan0144 | |
| Engine oil consumption and the importance of precise cylinder bore measurements. | 15th Jan 1937 | Box 144 \ 3 scan0145 | |
| Test procedures for oil consumption and Bentley detonations. | 19th Jan 1937 | Box 144 \ 3 scan0146 | |
| Tests on a Bentley head regarding detonation, plug failures, and oil pressure after fitting a new gear pump. | 19th Jan 1937 | Box 144 \ 3 scan0147 | |
| High oil consumption on Bentley cars and proposing an increase in sump capacity or oil level as a solution. | 1st Jan 1937 | Box 144 \ 3 scan0148 | |
| Chasing a reply regarding oil consumption on Bentley cars. | 19th Jan 1937 | Box 144 \ 3 scan0149 | |
| Request to fit a baffle to a unit to resolve an issue with oil pressure loss after braking. | 20th Jan 1937 | Box 144 \ 3 scan0150 | |
| Request to manufacture baffle plates for a Phantom III engine to prevent oil splashing onto valve springs during oil consumption tests. | 25th Jan 1937 | Box 144 \ 3 scan0151 | |
| Chasing a reply regarding oil consumption on Bentley cars. | 26th Jan 1937 | Box 144 \ 3 scan0152 | |
| Oil consumption rates and sump capacity for 3½ and 4¼ Litre Bentley cars. | 28th Jan 1937 | Box 144 \ 3 scan0153 | |
| Experiments to improve Bentley oil consumption rather than increasing sump capacity. | 29th Jan 1937 | Box 144 \ 3 scan0154 | |
| The oil consumption for car B 4 GA, detailing mileage and oil added. | 1st Feb 1937 | Box 144 \ 3 scan0155 | |
| Oil consumption report for car GUL 82, detailing top-ups and mileage efficiency. | 2nd Feb 1937 | Box 144 \ 3 scan0156 | |
| Oil consumption report for car GUL 1, detailing mileage and oil added. | 1st Feb 1937 | Box 144 \ 3 scan0157 | |
| Record of a car's oil consumption over a month, including mileage and top-up details. | 1st Feb 1937 | Box 144 \ 3 scan0158 | |
| The oil consumption for car B 2 GA, including mileage readings and oil added. | 1st Feb 1937 | Box 144 \ 3 scan0159 | |
| Latest oil consumption results for three Bentley trials cars. | 2nd Feb 1937 | Box 144 \ 3 scan0160 | |
| Oil consumption results for the 25/30 HP trials cars GUL-1 and GUL-82. | 2nd Feb 1937 | Box 144 \ 3 scan0161 | |
| Cover memo for oil consumption trial results for two Phantom III cars up to the end of January. | 3rd Feb 1937 | Box 144 \ 3 scan0162 | |
| Record of oil consumption for vehicle 3-AZ-38, detailing mileage, oil top-ups, and calculated m.p.g. | 2nd Feb 1937 | Box 144 \ 3 scan0163 | |
| Record of oil consumption for car 3-AZ-22, detailing mileage and oil top-ups. | 2nd Feb 1937 | Box 144 \ 3 scan0164 | |
| Final oil consumption return for January for 34-EX. | 4th Feb 1937 | Box 144 \ 3 scan0165 | |
| The oil consumption for car 34 EX. | 3rd Feb 1937 | Box 144 \ 3 scan0166 | |
| Top over-oiling and poor oil consumption on the Phantom model, proposing experimental modifications. | 20th Feb 1937 | Box 144 \ 3 scan0167 | |
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