
[1] Make a thorough inspection for leaks. Check all oil lines, and tighten connections or replace as necessary (par 204).
[2] Poor driving practices may be responsible and should be corrected. Speeding the engine will result in excessive oil consumption.
[3] Worn pistons or broken piston rings area common cause. Make the compression test (par 9).
[4] 0verheating may be a cause (par 89).
[5] Clogged crankcase ventilator may be a cause (par 207).
[6] Loose connecting rod or main bearings may be a cause.
The above information is from Automotive Trouble Shooting For WW2 Vehicles, Volume 1. Paragraphs that are less than 200 are from Volume 1 and paragraphs over 200 are from Volume 2.
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Automotive Trouble Shooting For WW2 Wheeled Vehicles: Volume 1
Automotive Trouble Shooting For WW2 Wheeled Vehicles: Volume 2