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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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