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Working on a historical fiction novel with heavy emphasis on early internal combustion (gas and diesel) engines. 1915-WWII. Wondering what kind of technologies might have worked for "home grown" oil and fuel testing/analysis. I.E. - my character has a Hotpoint electric iron and is doing crackle...

Working on a historical fiction novel. I have been in fleet management for decades and am familiar with "modern" oil analysis. However, I am seeking what methods MIGHT have been in place long before WWII...as early as 1915. To give you an idea, my "character" will be placing drops of oil on his...