I would not run it only at WOT and heavy load for break in but vary the load and RPM"s a bit....and no long periods of idling and light loads. You want to keep the engine working and warm so you don"t get varnish build up on the cylinders. If you have the flexiblity and implements you might consider 1-2 hours at medium load and 90% of rated RPM"s, another 1-2 hours with same load and 100% RPM"s, then step up to something that really works the tractor and run it like that for an hour or less. Cool downs and warm ups in between are good too.
I can also share I just toured the waterloo engine plant where they build 9L and 13.5L engines...every one goes on the dyno and runs for 20 minutes at light load and another 20 minutes at full load. Can"t say they do this at the 4.5L engine plant but I would expect they do something similar, so your engine has likely already had a little bit of "WOT" running.....
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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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