To raise a few eyebrows on the subject. Have no opinions, just the facts. Last place I worked before retiring had about 900 OTR rigs, running N14 Cummins power. When I started driving there, oil was dropped at 12k miles. This gradually grew to 15k, then 20k. Later it was chassis lube/inspect at 15k, drop oil at 30k. By the time I retired it was lube/inspect at 20k, drop the oil at 40k. Samples sent to lab at each drop, lab report forwarded to Cummins. Cummins gave the ok for warranty purposes. Used Rotella & Delo oils. Don't recall any engine failures while there. Consumption wasn't excessive, personally for first 300k wouldn't have to add between drops,later had to add a gallon at around 30k. Usually make veteran drivers take a new one off the lot at around 450k, assign the older units to new recruits, replace at around 550-600k. By that time rookies would have a track record, get a new rig. Willie
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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