Would not use synthetic of any type in any engine, number of Duramax and Cummins drivers I know also feel that synthetic oil in their engines leads to higher consumption/leaks. Several went back to DelVac/Rotella and their problems cleared up. I've never used synthetic in any of mine, as I'm not a believer, running Rotella in Cummins since '04, now at 187k have had no problems, uses absolutely none, does get black quickly.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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