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Rattsie..... ...yer oil pressure is supposed to be spring limited at about 35-40psi cold or hot. Some shadetree mechanics, in a miss-taken notion of improveing hot operating oil pressure, "stretch" the oilpressure relief spring. Well guess what? The stretch works extreamly well at cold oil pressure, but when the oil heats up, its pressure is limited by the nature of the oil weight. (30wt will be lower pressure than 40wt, understand?) This is the natural nature of oil viscosity. And guess what? 5psi oilpressure hot idle is normal for HOT lightweight oil. Again part of the natural results of temperatur on oil viscosity. Remember; oil pressure is a result of oil viscosity; temperature; pump capacity; (faster the pump turns, more capacity) and most importantly, bearing clearances. (loose clearances, low pressure) Obviously it bothers you and so you were smart enuff to ask. Me? I'd change to a heavier oil weight. I use 20-50wt Valvoline; it act like lightweight 20wt oil when cold and heavy 50wt when hot. Use whatever makes sense to you. Straight 50wt would work in the summertime but you'd want straight 30wt or 10-30wt for wintertime. Unlike modern automobiles, DO NOT USE 10-30wt year round in yer N-Tractor. Understand? ..... ...respectfully, Dell, the oily slicker
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