Hot oil take less pressure to push through the motor. Cold oil takes more pressure to push through the motor. Look at the oil gauge in your own vehicle on a cold morning, works just the same.
In the summer I will run heavier oil to keep the pressure up while under load and lighten up in the winter to save starving the motor on startup.
Heavier oil gives me the false sense of security that my 50 yr old tractor still runs like a new one.
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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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