Posted by Centex Farmall on July 20, 2014 at 22:34:21 from (72.105.161.209):
In Reply to: Oil for MD posted by n9lhm on July 20, 2014 at 17:02:45:
I wouldn't get worried about the zinc issue. When these tractors were new, oil was fairly simple. When the MD was designed they were still distilling crude oil to get the different weight products. That's why back then the type of crude made a huge difference. Ever see all the old ads that mention Pennsylvania crude? Now they can take garbage and turn it into gold with molecular cracking.
These tractors have low valve spring pressure and relatively wide contact surfaces for the rockers and lifters. There's not that much unit loading.
Shoot, even with new springs you can open the valves with your palm. Try that the LS-6 in your '70 Chevelle! Ain't gonna happen. That LS-6 really _needs_ the zinc to help with boundary lubrication.
You definately do not need an additive!
The oil you've been using hasn't hurt because technology wise it's way better than anything available when the tractor was new.
That said, you _do_ want the detergent in a "made for" diesel oil (or fleet type oil). The latest spec I think is CI-4, made for the new low sulphur diesel. It generally has lower ZDDP but the function of the zinc has been replaced by newer tech chemistry that doesn't affect the catalytic converters. The key is the "CI-4" or "CJ-4" somewhere on the label. The "C" is for compression ignition and "S" is for spark ignition. Both will be on there for fleet type oils (such as Delo 400 or Rotella). If there's a "C" something on your current label then keep on truckin'!
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