Have you had the valve cover off and checked the tappet clearance? If the valves have worn in to the seats,they might be too close and not quite letting the valves close all the way.
If it's any consolation,when I traded off my 4040 it was up to a can of either every four or five day habit. I overhauled it and it still didn't help.
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Today's Featured Article - Tractor Operator Safety - Loader & Backhoe Operation - by Staff. Loader Operation Do not transport anyone in the loader bucket. Always carry the loader bucket low for maximum stability and visibility, whether the bucket is loaded or empty. Always use the recommended amount of counterweihting to ensure good stability. Be careful when handling large objects such as round bales, logs,
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