Never much worried about the tier of gasoline just the grade. However the oil I wanted it to be as high in detergent as possible as I have seen engines that were started cold and run cold, or not been changed very regularly--an engine can be destroyed that way. So I use 15-40 oil with all the ratings for diesel. Runs fine and when I pulled an engine down after 100+ miles it was CLEAN. Little staining but no slug or other deposits. SO my recommendation is run the recommended grade of fuel, regular or premium, and a best detergent oil you can find. Diesel grade oil at 15-40 will do it, it cost a small amount in gas mileage but not noticeable and your car will be running when all the rest are parked.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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