Posted by sotxbill on September 10, 2015 at 07:05:06 from (104.5.24.112):
In Reply to: Tractor Vet posted by True Son on September 09, 2015 at 19:50:20:
all of your hd oils will be low ash... and syn oils will be NO ash.
back when these new oils were NOT available, and only single weight oils were sold, the origin of the well was important for ash, wax, and sulfur in the oil. Some wells were "sweet" and others were very dirty and corrosive oils. So pennsoil or north texas sweet were important sources for oils with low ash, low wax, right out of the ground.
Now due to extensive refining, all hd oils are low ash, low wax, low sulfur and have extreme wear additives, acid fighters and sludge fighters built in. The heavy paraffin and contaminates have been refined out. And viscosity extenders now make a oil act like 15 w at room temperature and 40 weight at 220 degrees so now a 15w-40 oil will give you better performance over a wider range of temperatures. These heavy duty high performance oils did not exist back in the 50s, 60s and even somewhat into the 70's
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