First of all, it depends where you live. Here in New York at present, we have three different diesel fuels. All different, it's NOT just the color. In some other areas, it differs.
Heating oil grade is what farm fuel was until a year ago. It has the most lube in it, but is now illegal to use in any engine. It is dyed red.
Now, farm and off-road diesel is medium-sulfur with less lube, but not as low as on-road ultra-low sulfur. It is also dyed.
Highway ultra-low sulfur fuel is legally required to have a lube additive put into it - to make it safe for older mechanical injection pumps - like your's.
The main question is - since additive is expensive, are you always going to trust there is enough put into your highway fuel?
Stanadyne Roosamaster, Bosch, and CAV all call for fuel that has enough lube to make no more than 460 microns. The number is just a measure of metal wear. The lower the number, the less wear. So, mechancal pumps are designed for "460 micron" fuel. All the low-sulfur fuel AFTER the additives are put in - is rated 520 microns. That causes excessive wear according to tests. That's why there are so many fuel-lube additives on the market for diesels.
Cheap insurance is to just add some two-stroke oil to your diesel. It is the most cost-effective way to ensure your fuel won't cause premature pump-wear.
Add two-stroke oil at a 200 to 1 ratio, and it brings "520 micron" fuel down to 360 microns. That is pretty cheap insurance.
Stanadyne lube additive does the same when added at a ratio of 1000 to 1 - but it's expensive.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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