Mornin' Dave, asking an oil question on this board is like pokin a stick in a hornets nest !! However, had the same question myself a few years ago. I asked both Conoco and Shell. Got the same answer from both, still using 15/40. Just parked a 930 case last season with a very tired engine. We powered an irrigation pump with it amoung other chores. We put about 5000 hours on it - all with 15/40 in it. ( and who knows how many hours the tractor had when we got it ! ) I use 15/40 in everything but my four wheeler and my 97 chev pickup. Ken
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