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We run 15w-40 in everything on our farm from a small MF 165 gasser, to our biggest Oliver 1855 diesel. Even ran it in my truck during the summer when I ran it more often. If it runs alot in the winter and it's a smaller gasser, I'd run 10w-30 in it. We used to run that in our 165 but the extra case of oil just wasn't worth it. We buy it in bulk in a drum. If it doesn't get run much, change the oil in the spring after to get all the condensation out from the short winter runs. Otherwise if you use it quite a bit, every 100 hrs. use is the general rule of thumb. Don't have to go out of your way to buy a straight weight oil if your supplier doesn't have it on hand, even though they can order it, and a multi-weigth oil is fine in MOST situations and won't do any more damage than any other oil- espescially if it doesn't rack up more than a few hours every year. If it were mine, I'd run either 10w-30 or 15w-40, depending on it's job and amount of use during what seasons. Donovan from Wisconsin
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