Posted by jdemaris on January 15, 2011 at 06:47:07 from (67.142.130.16):
In Reply to: engine oil posted by Mike from Wisconsin on January 14, 2011 at 16:52:55:
Varying opinions don't change the science of what can happen in an old engine.
If by chance the engine is heavily sludged up inside, the last thing you want to do is put a high-degergent oil in there. Degergents disolve crud, and you don't want years of built-up crud disolving now. You can ruin and engine and I've seen it happen, first-hand, several times.
I've pulled apart old tractors that were only run on non-degergent oil and were still clean inside. That because they were well maintained.
On the other hand, I've seen some with a 1" thick layer of sludge in the oil-pan and under the valve-cover.
Last tractor dealership I worked at, we used a general rule of thumb. Non-detergent in older tractors with unknown history, and high-degergent in all tractors - including olds ones if already clean inside.
For those that say use degergent only - I'd like to hear some explanations about what they think happens when years of crud gets loosened and runs through the engine, oil ports to bearings, etc.
Also note that different degergent oils have different levels of degercency. It's not always easy to know. 30 years ago, Quaker State diesel and tractor oil was known for having low detergency, and Deere "TorqueGuard" extremely high detergency.
With any old tractors with engines that appear to be original - this is what I do. I put degergent oil in, run the tractor and watch closely. If it turns black very fast, I take it out and put in non-detergent.
You can also play around, and mix 1/2 and 1/2, or 1/4 and 3/4, and try to clean an engine slowly. I've got an all original Case VAC (never been rebuilt). It was very dirty inside, and for years I screwed around with mixes of degergent and non-degergent oil. After 20 years, I now use full degergent and it's fine. I only went though the effort because I don't like paying extra for non-degergent oil.
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