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Hello, 2008 Hino 165 4 cyl 117,000 miles plus idle 4-6 hours per day 1100rpm Getting P0087 code only on the highway driving at 55 and more uphill Air and Fuel filters changed (replaced 5 times in last 2 month) DEF dropped and washed and reinstalled. Less then 0.5 psi drop Dealer blamed...