Heat is an enemy of engine oil. It breaks down the additives in oil. The longer you run between changes the more heat your oil is exposed to. And the oil gets dirtier the longer you run. Think air cooled engines run slightly hotter than water cooled engines, so oil additives may break down quicker. I would stay with a normal change interval if I had one of those new air cooled engines. Do think the newer synthetic oils could run longer change intervals. But who runs expensive synthetic oil in a mower or tiller engine.
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Today's Featured Article - The Tractor Parade: Story of a Case SC - by Bernie DeLon. On a early fall morning back in 1994, I opened the newspaper and happened to spy an article about a local antique tractor club having their annual show that weekend.
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