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My OD light now flashes. started out it would be every once and a while. Now I see it every day. If I go in reverse with a small trailer it seems to make it blink. it will go off after about 2 min. sometimes i'll hook a trailer up, put it in park and it'll rev up to 1,000 for a sec then go back down. OD light comes on. Do I need a flush? I have an external filter. maybe thats plugged. any ideas?
