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: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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