Doug Ruth Posted December 30, 2022 Share Posted December 30, 2022 Simple question- what grade of lube for the rear end differential gears and what quantity for our 1918 Buick? None of my literature addresses this. Link to comment Share on other sites More sharing options...
Akstraw Posted December 31, 2022 Share Posted December 31, 2022 (edited) My 1915 Dyke's manual says "two parts grease, one part oil". My 1915 Buick owners manual calls for "steam cylinder oil", while the 1917 Questions and Answers on Automobile Design Construction and Repair recommends [steam] cylinder oil or a mixture of [steam] cylinder oil and engine oil. More helpful, perhaps, is the advice of Harold Sharon in Understanding Your Brass Car: "Modern 90/140EP rear end lubricant works well." Edited December 31, 2022 by Akstraw added more info (see edit history) 1 Link to comment Share on other sites More sharing options...
Mark Shaw Posted December 31, 2022 Share Posted December 31, 2022 (edited) SAE 250 or equivalent. Most rear ends have a bottom drain and a fill plug at the half full. If you use lighter weight lube, it will often leak out onto the rear brakes. Viscosity Charts - Bob is the Oil Guy Edited December 31, 2022 by Mark Shaw (see edit history) Link to comment Share on other sites More sharing options...
Larry Schramm Posted January 1, 2023 Share Posted January 1, 2023 This is what I use. You might want to read the material specifications. https://www.lubriplate.com/Products/Fluid/SPO-Series/SPO-299/SPO-299 Link to comment Share on other sites More sharing options...
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