Posted by Steve@Advance on July 20, 2016 at 19:35:54 from (107.203.134.67):
In Reply to: synthetic oil posted by nhbalerman on July 20, 2016 at 18:55:26:
I supposed you could, but IMHO would not be economically productive.
Synthetic oil has it's place, especially in high heat, turbo charged engines, air cooled engines, high tech engines, applications that see long hours, hard service.
The older tractors were designed to work with the oil that was available "back in the day". They turn slow, had low compression ratio, wide bearing surfaces.
Today's oil is much better, additive packages that didn't exist a few years ago, viscosity modifiers, detergents and corrosion inhibitors.
One advantage standard petroleum oils have, you can still get diesel engine oil with the zinc additive that works well with the older engines with flat tappet lifters. As far as I know, none of the synthetics have zinc. Zinc is being phased out as it doesn't get along with emission controls, and is not needed in roller cam engines.
If this is a pulling tractor, or is still working hard, and has been recently rebuilt and everything clean, synthetic could be an option. But I would personally hesitate to switch to synthetic on an old engine with heavy deposits in the crankcase.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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