Do an oil analysis at your regular change interval before actually changing the oil. If the oil tests good, then go another thousand or two and do the same thing until you find the interval that you need based upon your vehicles duty cycle. You may find that you can easily double your current interval. Lots of stop and go city driving is considered heavy duty service and requires more frequent changes. Continuous highway driving is less severe.
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2005 Newell 45 Ft.
Detroit 60 Series 515 HP Engine
Some people call me the Space Cowboy
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