Does it have the square nose hood or the slope nose? Disappointed with the gear shift lever assembly in my 4255, which they fixed in the 4300 series. Only issue I have had is a Perkins head/block that contracts too much below 0F and allows coolant to leak. Did a complete head gasket and helped to slow it down. Last solution to the issue is to let it sit outside mechanics shop overnight on a cold -30F night and torque down the head bolts to spec then. Had planned to do it this past winter but never found the time.
I like the tractor. And they were very popular in England/Australia/Canada. They were the last model series made in Harry Ferguson's Coventry plant before it was demolished in 2002. Their rear end is the same as the MF 165, so bullet proof in that aspect. You can search opinions on the mf 4200 series on Google and find a lot more info through British farming forums. Mine is easy on fuel, probably around 3 gallons per hour.