A Detroit will typically run away when it starts sucking oil past the blower seals, as that's the only place in the combustion air side of the system where you have a vacuum. Anywhere else, be it the air box around the cylinders, inside the bore's, etc, is all under positive pressure created by the blower. This pressure will always be higher than the pressure of the oil draining back to the crankcase from anywhere.
As far as it getting past the rings, when that starts to happen, and oil gets into the air box, it tends to drain out the air box drains. I've seen engines so worn out that the air box would drain better than a gallon of oil out every few hours, and the engine still ran.
Too, I'll go on record and say that as a multi-grade oil warms up, it gets thicker, and as it gets colder, it thins out. In other words a 10w40 will act as a 10 weight at low temps to allow it to flow better and flow where a heavier weight oil won't flow enough to provide proper lubrication. Conversely, the 40 weight part of the specification means it will act as a heavier oil at higher temps to keep it from becoming too thin and not providing enough lubrication.
On that note I've got one customer who had thousands of hours on the inline 6-71's as well as a couple of 6v and 8v-71's without any problems.
In the end though I gave up arguing oils and filters with folks looooong ago. With all of the equipment owners I have encountered over the years, the choices of oils, and filters is as varied, and as much a matter or personal prefferenceas anything else.
That said, I try as much as possible to run a HIGH grade oil from LE in at least my service truck. I've seen it more than double turbo life in a customers machines that consistently wore then our due to it's operating conditions, but more impressive was the 12 year old 3306 CAT engine that, when measured out, came back standard on every measurement taken....after 12 years of running an excavator in a quarry. Now that's some good oil.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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