The 686 is nearly identical to the 666 before it. They just renamed it 686 when the 86 series came along in 1976. I don't see much of a comparison with a 656 other than they were both red. One change did occur in 1979 when the engine went from 312 cid to 310 cid. The info I see on the Nebraska tests show the Deere to have both a 1000 rpm PTO and a 540 whereas the 686 just has 540. Comparing the bare tractors the Deere weighs about 1000 lbs more than the 686. Personally, the TA would turn me off but there are other things to look at.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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