(quoted from post at 05:05:19 12/31/10) The detergent in the oils is the problem, as it corrodes the soft metals used in the Transmission and Pump over a period of time and if it were left, the parts concerned would disintegrate if they hadn't worn out first, but it would certainly cause more clearance between the parts concerned. The original oil that was specified (GL1 type) contained no detergent at all, but now all oils contain some detergents and have better lubricating properties than previously, so it would be much better to take advantage of this and use an oil that better meets your local operating conditions regarding temperature which has always been a problem for us.The Multi-grade 10W/30 or 15W/30 oils (depending on your local low temperatures) have only minimal amounts of detergents if you use the oil for gas engines, you should NOT use the oil meant for Diesel engines as that contains a lot more detergent.
The GL1 type oil, would go very thick when cold and if you are in a very cold climate this is a serious problem as you just can't start the tractor and start work, you need to start the tractor and wait until the oil is thin enough to flow and be able to operate the hydraulics, quite often it was not possible to put the transmission into gear. The action of the Gearbox turning and the Pump running would warm the oil slightly to make it flow, in some areas you could only start the engine with the clutch pedal pressed down (which you should do anyway) and you would need to keep it there for quite some time, occasionally trying to lift your foot off the pedal to get the Pump and gearbox to turn or the engine would stall. With these Multi-grade oils there is no longer this problem. The people who complain that these Multi-grade oils are not what was recommended by the manufacturer and we should still be using GL1, are the ones who do not have any problems like this, if they had, they would know that to continue using it is not practical. John
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