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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Log of oil sample mileage for two vehicles, 26.G.VI - 25/30 and O.B.IV - BENTLEY, noting oil filter performance.

Identifier  ExFiles\Box 145\3\  scan0168
Date  7th April 1938
  
600u
1235/
OIL SAMPLES (HANDED TO Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}) 7.4.38.

26.G.VI - 25/30.

Total miles run since fitting filter -

W.1. 3,694 miles.
W.2. 5,826 miles (Filter leaking. New unit fitted).
W.3. 8,529 miles.
W.4. 10,722 miles.
W.5. 17,930 miles. (Filter leaking. New unit fitted).

O.B.IV - BENTLEY.

Total miles run since fitting filter -

B.1. 8,473 miles.
B.2. 11,017 miles.

Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux}
  
  


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