The ZDDP levels were brought down by Big Brother as it tends to foul the cat converters on new cars, and the manus were required to make the cats last longer. The new cars all have roller lifters or followers and can get by with the reduced ZDDP. Anything older with a flat-tappet setup needs a little help, the sliding-friction being where the ZDDP is needed. An easy solution is to use off-road oil like Brad Penn, available at most speed shops, Valvoline VR-1 from Kragen etc., and some of the Mobil1 stuff still has good levels of ZDDP. Considering that most of these old tractors are more toys/pets these days and don't rack up that many hours, no reason to not go with the right oil and protect them, just doesn't cost that much more
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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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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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