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There are many lengthy discussions on oils int he archives.. probably as many opinions as there are choices. I'll run down the brief of the major opinions. Some don't like to switch to det if the engine has been non-det for its life, fearing: it will leak in places that may have been sealed by deposits.. aand also they fear that a large amount of gunk will suddenly jump into suspension and clog/gum up the works. Some truth to this... Some gradually change over to a det oil, by using half det and half non-det at an intermediate oil change. Some go full detergent, but half way thru te oil change interval, they change the oil filter... That would be my vote.. change to a good detergent oil.. and keep an eye on what it looks like.. if nasty.. change the filter, and or oil before the scheduled change. When i got my jd-b.. I couldn't identify what mysterious oily fluid was in the crankcase.. I went to wallmart and bought their big 2.5 gallon jugs of 'supertch' oil.. fairly generic.. but met the gas engine standards.. etc.. and was cheap cheap cheap. I changed the oil in that tractor 3 times that week. I would let it run a few hours and pull the nasty filter and change the oil.. last change was fairly clean.. so then I went with my staple.. a valvoline fleet sae 30wt.. hd and diesel service rated. Some like the light multiweight oils.. like 10w30.. others claim the 10w30 is too thin and makes the oil pump loose prime. ( my opinion is that the oil pump looses prime due to a problem.. not the oil.. but? who knows? ) Probably the bulk of us run a straight 30wt.. or even a straight 40wt if we need a little more oil pressure. Even a heavy multi-viscosity 20w50 is reported by some of the longterm members as working great. Pretty much any oil you can by anywhere, any brand.. including jiffy store '80 cent a quart special.. is going to be superior to what these machines ran on in the 30's 40's and 50's when new. There has also been some limited discussion on synthetic oil lubricating and providing better protection at initial startup than a dino oil. Also it is reported that burning synthetic oil doesn't smoke nearly as bad as a 'blue mosquito fogger' that is burning dino oil... ( I can't verify that .. but if true.. a moderate smoker can look good for a show or parade with a quick oil change...? ) Best thing to do no matter what your choice is, is to keep clean oil in the engine and change the filter regularly. don't forget to service the radiator and the air cleaner.. Soundguy
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