DEF gauge and warning
I'm at 6,500 miles only had DEF tank filled at dealership when new. My gauge is just below 1/4 with no lights on. When does the DEF warning first come on and how many miles after 1st warning do I have before I need to fill or add DEF? My dealer told me I should be good for around 10,000 miles give or take. I'm only at 6500 and less than 1/4. Thanks.