It will tell if the oil meets your engine specifications, found in the owners manual.
Very important for late model engines with emissions and high tech variable valve timing, or GDI (gas direct injection).
Old tractors will do just fine on diesel oil or gas oil as long as the viscosity is close. Multigrade is good, but keep the numbers high, no 0, or 5, stay with 10w 40 or 15w 40.
Oreillys doesn't make the oil, they buy it packaged for them. Who knows what the maker actually is, but you can trust it is what it says it is, they would be subject to mega lawsuits for selling something that falls short!
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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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