2012年9月14日 星期五

What is the Best Lubrication Oil to Use in a World War Two Jeep?


During the war years the choices were limited to mono-weighted lubrication.  The "best" choice is to use what the manufacturers called for using.  In the jeep's case it was 10 weight in temps below 32F but above 10 degrees F and 30 weight for temps over 32 degrees F.

There are folks that have experience racing and rebuilding modern engines the recommend more exotic concoctions of lube, such as, 20w50.  I won't argue the point here but just know that the higher the viscosity (the weight number) the higher the friction...I know oil is so slippery, it is  hard to think of it as generating friction!  The higher the friction the higher the heat that is generated.  Whether or not this is cause for concern is left up to you to decide---at least until we can an automotive lubrication engineer to comment.

As for me, I use 10w30 as it covers both weights originally required by the manufacturer to service the engine.

 

Gear oil?  Stick with 90w.  It is what the manufacturer recommended. Stay away from higher numbered weights. Back to the friction thing.  I did get a lubrication engineer to comment on gearing and lube.  He was able to prove through some lengthy calculations that the higher the viscosity the greater the heat that is generated in a given gear set.  Big deal?  Generate enough heat and you can damage the gearing teeth. Unfortunately, I proved the expert correct with my jeep.  I had used 140w lube oil based on the recommendations of the "experts" on line.  The cluster gear in my T-84J transmission lost teeth and damaged other gears in the case.

Brands?  I don't think it really matters.  I do stick with "name" brands and stay away from house brands at discount or supermarket type stores.  The only exception and then only in areas that meet certain criteria would I use specialty oils.  Amsoil creates a great product but I think it is unnecessary unless you live in parts of the world with extreme temperatures.  When I lived in North Pole, Alaska with winter temperatures dipping down to -45F (and lower!) we all seemed to use synthetics and Amsoil was the most popular at the time.  We used synthetics everywhere--engine, transmission, and transfer case.  I guess the other extreme (heat) would be a good place to use these oils as well.




Robert Notman has authored or edited several books related to the WW2 jeep, including Military Maintenance for MB/GPW Jeeps 1941-45, BANTAM, FORD AND WILLYS-1/4-TON RECONNAISSANCE CARS, WW2 Pilot Model--The Ford Pygmy, Automotive Trouble Shooting for WW2 Wheeled Vehicles: Volume 1,and Automotive Trouble Shooting For WW2 Wheeled Vehicles: Volume 2. He has also written for Military Vehicles Preservation Association's Army Motors and also Military Vehicle Magazine. See his website at http://www.42FordGPW.com





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