We have a 2001 JD 4600 that we use JD 5W-30 in, as recommended by the owners manual. This tractor is only used about 50 hrs a year so I don't change it more than once a year. The book says 5W-30 is good up to 85F, when it gets warmer than that I put it away and go fishing. If I needed to use it a lot in warmer weather I would probably switch to 15W-40 but we keep it in Northern MN and I want to be able to plug it in and use it for snow plowing in a couple of hours. This has a Yanmar engine that runs quite cool, 150F regardless of conditions.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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