Your old 4020 might be in better shape than you think it is. Hope I'm not giving away any proprietary info, but here is Deere's opinion on the subject: {Scroll down to the bold type}
Solution Number: 23379
Solution Summary: SIB 93-04-30-04 Engine Oil And Consumption Guidelines / All Tractors
Publication Date: Jul 15 2003 **Paper copies of solutions may not be the most current solutions** Also reference DTAC solution 23808. Old SIB-R80-220-1 is replaced by SIB-93-04-30-04. Complaint: Not certain of the recommended engine oils to be used during the different stages of engine life. Oil consumption is excessive. Problem: The use of John Deere Torq-Gard Supreme Plus-50 engine oil during the first 100 hours on a new or overhauled engine will not allow the engine to “break-in” properly. Guidelines were not available for determining the rate of oil consumption. Solution: Type of engine oil that should be used: New engines (less than 100 hours), are filled with a specially formulated SAE 10W-30 break-in oil with the following features: * Provides a controlled "chemical break-in" of parts affecting oil consumption and blow by. It also provides scuff and wear protection for highly loaded surfaces. * Provides for cold weather flow to -25 deg. C (-13 deg F) and hot weather protection to ambient conditions of 40 deg. C (104 deg. F). * Minimizes piston deposits during break-in. * During the break-in period, recommended make-up oils are listed in order of preference: 1. John Deere break-in oil (Feb. 94 availability) 2. Torq-Gard supreme SAE 5w-30 3. Plus-4 SAE 10w-30 4. SAE 10w-30 API SG/CD oil Important: Do not use Torq-Gard supreme plus-50 during engine break-in. The superior lubricating properties of this oil will not allow the engine to break-in properly. The recommended oil drain interval is 100 hours. This 100 hours of engine operation should be at different engine speeds (not constant full throttle usage) with normal engine loads. Engines may require a longer break-in period when run at constant speed and/or light load usage. In these situations, an additional 100-hour break-in period is recommended using a new change of John Deere 10w-30 break-in oil. Rebuilt engines require the same break-in procedures as listed above for new engines. Mature engines: When changing to a premium oil such as Torq-Gard Supreme Plus-50, little oil consumption change is expected although a small percentage of engines may experience a noticeable change in consumption rates. This may be due to the following factors: * The previous oil may have left deposits on internal components. Use of the plus-50 oil will cause different chemical reactions in those deposits. The time required for the engine to regain the previous oil consumption rate will vary from one to three normal drain intervals. * Torq-Gard Supreme Plus-50 contains a high performance anti-oxidant along with other additives resulting in the oil remaining in the specified viscosity grade throughout the recommended drain interval. * API oil grades CD, CE, and CF-4 universal engine oils do not provide this oxidation resistance, which results in more rapid thickening. Increased oil viscosity can reduce oil consumption. The above information on mature engines applies to Plus-50 oil, however engines using other premium oils have experienced similar results. Engine oil consumption guidelines: (See SIB for chart) * All engines do consume some oil. The consumption rate depends on loading, design of key parts, and engine condition. Since fuel consumption is an indicator of operating power levels, fuel used versus oil consumed is a critical factor in analyzing oil consumption complaints. Shown below is a chart to determine fuel to oil rates. * To use the chart, accurately measure the oil and fuel consumed for a minimum of 500 gallons fuel. Locate the fuel used on the horizontal scale and the oil used on the vertical scale. For example, if the engine uses 1500 gallons of fuel and 6 quarts of oil, the consumption ratio is 1000:1 and is well within expectations. A second example is 500 gallons of fuel and 4 quarts of oil. This ratio is between 400:1 and 600:1. The customer should continue to monitor fuel versus oil usage. * Long term oil consumption (3 oil drain intervals minimum after the engine is broken in) with consumption rates poorer than 400:1(100 gallons of fuel and 1 quart of oil) indicates a need to monitor/investigate. Suggested steps would be: 1. Check for signs of ingested dust or perform an oilscan test to check for silicon. 2. Check for proper crankcase oil fill level. 3. Perform compression test to find low compression cylinders. 4. Inspect pistons for carbon deposits in the ring land grooves. Note: ring gap alignment does not prove the leak source. 5. Measure valve stem OD and valve guide ID to determine clearance. Note: intake valves do not have the valve stem seal and some oil deposits on the valve stem tulip are normal. Problem: Complaints of excessive engine oil consumption have resulted in needless repair. Solution: First, determine whether oil consumption is normal or excessive per "guide for oil consumption". If an engine uses oil up to the following amounts, it can be considered in normal oil control. Diesel engines (naturally aspirated or turbocharged) average of one gallon (3.79l) of engine oil to each 200 gallons (757l) of fuel consumed or one quart (0.95l) of oil to each 50 gallons (190l) fuel over a 100-hour oil change period. Although oil usage over the above amounts would be considered above normal, we do not recommend overhauling an engine until the above rates are exceeded by 25 percent. The overhaul point would be: Diesel engine average of one gallon (3.79l) oil to 150 gallons (568l) fuel or one quart (0.95l) to 37.5 gallons (142l). Also, make sure the oil is being consumed and not lost through leakage and that the oil is being changed as specified. If oil changes are stretched past the recommended change periods, oil consumption will increase due to oil breakdown. Should an engine's oil consumption exceed the guidelines, use the following checklist to determine problem.
*Preliminary check: 1. Engine oil grade and viscosity 2. Engine oil change intervals engine 3. Oil level accuracy *Visually inspect for leaks: 1. Oil pan gasket 2. Front crankshaft seal 3. Cylinder head and cylinder block (pipe plugs, cracks, etc.) 4. Rocker arm cover gasket 5. Vent tube carryover caused by: a. Defective baffle in a rocker arm cover (ref: sib r79-20-4) b. Excessive engine oil pressure. c. Restricted vent tube 6. Turbocharger leaks caused by: a. Turbocharger lube oil return line restriction b. Defective seals allowing oil into exhaust or intake ports of turbocharger c. Restricted air intake system If cause of oil consumption cannot be determined by preliminary and visual inspection, engine disassembly is necessary. Check the following upon disassembly: 1. Worn valve rotators or valve seals 2. Worn valve guides or valve stems 3. Broken or worn rings 4. Worn pistons and liners 5. Rear crankshaft seal 6. Dowel pin hole in crankshaft 7. Welch plugs and pipe plugs on rear of block. 2850, 3055, 9300, 4040L, 3140, 2855, 4240L, 8310, 4040, 8960, 6210L, 6100, 2140, 1120, 5320, 4755, 6405, 1950, 8220, 1640, 4455, 8560, 9620T, 510, 6400, 2150, 4240, 920, 9100, 9300T, 2640, 3050, 3350, 2155, 3030, 6605, 4630, 7200, 6220L, 8420T, 2350, 5520N, 7520, 8450, 6220, 7710, 7400, 6030, 9420, 3640, 6400L, 5205, 7600, 4450, 6120, 2650, 9120, 6800, 6410, 8410, 6500L, 2510, 6110L, 5420N, 1630, 9220, 8970, 6510L, 5310N, 2450, 6500, 2630, 5420, 5010, 3010, 2020, 8430, 9200, 8850, 8520, 8440, 4650, 9400T, 7320, 8210T, 2555, 6310L, 2355, 940, 7405, 8220T, 5510, 840, 7410, 5105, 2550, 9320, 6600, 9520, 8300T, 2940, 4430, 8120, 2840, 5300, 1030, 8320T, 9420T, 4030, 2030, 9320T, 3040, 2040, 4240S, 1010, 1040, 8520T, 4255, 4955, 4760, 1350, 5410, 6300L, 3150, 4640, 8770, 5200, 1140, 8210, 1130, 930, 6210, 7220, 3155, 1650, 2250, 5400, 6110, 4620, 8400T, 3130, 4250, 3650, 8110, 8010, 8200T, 3255, 5220, 4230, 8200, 2130, 1850, 4040S, 7210, 5520, 4960, 6310S, 5210, 4850, 8760, 2010, 8310T, 4840, 820, 8100, 2750, 8400, 7800, 9620, 5400N, 1020, 2240, 8570, 8640, 4520, 2255, 2355N, 4320, 1750, 8320, 8020, 2040S, 7810, 1550, 4555, 9520T, 1530, 7020, 2855N, 8420, 5510N, 1450, 8110T, 2440, 9400, 7700, 4440, 6510S, 2755, 2120, 7610, 3020, 6320, 1520, 5320N, 8120T, 830, 4050, 4010, 4560, 2520, 6200, 6520, 4055, 7420, 5500, 6410L, 5310, 8410T, 5020, 8100T, 1250, 4020, 6200L, 710, 6420, 2955, 5500N, 4000, 8300, 8650, 6300, 1830, 8630, 8870, 2950 ERRATIC, SPEC, RPM, DEBRIS, OIL, SMOKE, CHECK, LOW, LOSS, HIGH, LEVEL, FUEL, HEAD, CONTROL, SPEED, CYLINDER, JDM MISC, ENG, F1340, F0400
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