Check gages lights up when braking, even at slow speeds. Just had the ops replaced, new oil and filter. I used omega 907 flusher before this oil change to get the worst sluggy stuff out. Still I get the check gage light. I removed this filter recently.￼(pic) Its a 99 6.5. Sidenote: on top of the inlet, there's a black box and a plug, anyone know what that is? And maybe the pros recogn7ze the engine from the pic.
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