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My 03 lb7 has developed a real vile exhaust smell, it almost brings tears to your eyes. Just got truck back they did new glow plugs in it, but when I checked the oil it didnt appear real overfull, but I did notice it was real thin. Smells a little like diesel, I know I saw a thread about a wick test for the oil, but cant seem to locate thread. Anybody help me out?
 

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Put a drop of engine oil on a clean white paper towel. If it's fuel contaminated, it will produce a "halo" or ring of lighter color in a few minutes as it soaks into the towel.
 
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