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Please remember that all diesel fuels are not the same and even though refineries have specs to meet; quality can and will vary from plant to plant and company to company. It may be called coke but it is likely tars that drop out after combustion because of temperature variations ( from a liquid to a solid ). I have not heard of any problems in the Northwest as noted from the many discustions. Maybe that is because our crude comes from the Tarsands and manufactures into a high quality diesel product. Great many trucks up here are run hard from plus 90 to -50 F from summer to winter and run 24 hours a day much of it idling, with no sooting or slobering. Easy on engines to leave them running when cold than to stop start multi times each 24 hour period. Maybe we baby those engines too much and cause all these problems. Company trucks are always loaded, and driven hard over very tough conditions some 60,000 to 100,000 miles per year. a lot of these trucks just see minor maint. like oil changes. Just some thought and experiences of the Oil Patch life.
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