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If you search oil in the archives.. you will find at least one or two opinions ( per member! ) about the subject. I'll give you the skiny. Original spec was sae 30, with some consideration for weather.. Some of us have a 'tired' engine.. and like sae 40.. to keep some pressure on the gauge. Others like a multi weight.. like 10w30 . Some report a loss of prime with the lighter multi weight.. but that is probably a symptom of a cracked pickup line, made worse by the lighter oil anyway. Still some use synthetic products.... I hear even when it burns, it doesn't moke bad? can't verify that personally. Then there's the Nh dealer recomendation.. mine says 15w40 ( just like for thier diesels.. etc.. and it is what they keep the shelf stocked with) Next is detergent vs. non detergent. Some like the non/d and are worried if they convert to a det. that 50 years of crud will break loose. ( might ).And or rings that are sealed right now by crud will break free and loose compression and burn oil.. etc. About 50% consensus here for and against. Pretty much main suggestion is if you change to det. plan on changing the oil and filter often at least for a couple oil changes. As for oil and filter brand? Use a good grade clean oil, and change that filter. You can get the filter just about anywhere.. it crosses with a fram C3 or C3p.. napa has it too? donno? 1010.. just a guess on that number.. someone will correct me if I'm wrong. Most of those cartridge filters come with a new gasket.. use it.. and claen the oil cup good. Also, service the air cleaner.. clean in solvent of choice ( gas or deisel / mineral spirits/ kerosene.. etc.. ), dry, and then fill oil bowl to the line with whatever engine oil you chose to use. Keep in mind that a side mount distribuitor and the oem genny had an oil cup too.. a drop will do ya.. engine oil is ok.. but I use a litle precision oil can with some 3in one oil.. works great. Good luck... I stayed unbiased on this as this is a 'holy war' topic.. like chevy vs. ford, footbal teams.. etc. ( I put valv. sae 30 in mine, and hit it with some stp 'old' engine treatment .. red bottle). I use a napa filter element if I have one.. though have used the fram c3, and one from an online dealer...all looked ~similar~.) Do whatever you and your tractor and pocketbook feels best with. Soundguy
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